Dick Weindling (local historian) quoted by Dominic Penna in the “Daily
Telegraph” 3 June 2021
Perhaps Mrs. Yaras did not "decide on Lillie Langtry", as Mr. Weindling gratuitously seems to have assumed ...
Lillie's residence in the "high class areas of Mayfair and Belgravia" pertained to an earlier period of her life; namely to 1876-1878 (Belgravia's Eaton Square) and to 1878-1880 (Mayfair's Norfolk Street).
But by the Summer of 1880, secretly pregnant, her husband disaffected and bankrupt;
bailiffs knocking at her door in Mayfair, and the contents of the house being auctioned off, Lillie was facing a serious existential predicament ...
in "Lillie Langtry - Manners, Masks and Morals", p.180, Laura Beatty/Chatto&Windus, 1999
She had begun to contemplate a career on stage, but first and foremost, she needed an alternative place to stay,
preferably, given the "circumstances", well away from Mayfair and the glitterati but, her native Jersey aside, where?
in "Lillie Langtry - Manners, Masks and Morals", p.180, Laura Beatty/Chatto&Windus, 1999
Could Alexandra Road have been a "suitable" place for Lillie's overnight trysts with the PoW - or as a discrete hideout later? It's possible!
Alexandra Road was part of St. John's Wood's Eyre Estate - a legendary neighborhood known as "An Abode of Love and the Arts". 
The sophisticated and quietly discreet atmosphere of the area, would have suited her. Academics, actors, architects, musicians, painters, playwrights, poets, psychoanalysts, sculptors, suffragettes, theosophists, writers, not to mention other royal mistresses, have resided in St. John's Wood since its inception in the early nineteenth century ...
Image courtesy of the Lords Cricket Ground Museum
A painting by Sir Robert Ponsonby Staples and George Hamilton Barrable (1887) illustrates this. It depicts a match at the Lord's cricket ground in St. John's Wood - a short ride from Alexandra Road by Hansom cab (approx. 1,3 mi or 2,1 km).
The Prince and Princess of Wales - later King Edward VII and Queen Alexandra - are seen standing by the pitch on the right; the Princess is holding a white parasol.The lady at the front (left of the painting) holding a note in her hand is Lady de Grey - another close friend of Oscar Wilde. Some five seats to her right, sitting in front of that grey-bearded gentleman and wearing a yellow dress and red bonnet, is none other than Lillie Langtry. Prince Albert, with whom Lillie also had an affair, is the top-hatted gentleman seen a couple of seats to her right.
But more to the point …
What kind of people lived in Alexandra Road - particularly around the time Lillie was supposed to have lived or stayed there? Here is a shortlist:
● William Leighton Leitch (1804-1883)
Lived at 124 Alexandra Road between 1872-1883.
A Drawing Master to Queen Victoria for 22
years; Vice President of the Royal Institute of Painters in
Watercolours in London, for twenty years. Many members of the aristocracy were amongst his pupils - the Princess of Wales (1863-1901) being his last. (9)
William Leighton Leitch Alexandra: Princess of Wales
● Frederick Tully Lott (1828-1899)
Lived at 119 Alexandra Road until 1899.
A painter from St Helier, Jersey, lived at this address at least between 1881 and 1888. His name and address appears in the 1881 Census and is listed in the Post Office Street Directory of 1888. (1)(7)(8)
Frederick Tully Lott (c.1874)
Rue de l'Horloge in Dinan with the church of St. Saviour in the background
● Charles Richardson Knowles (18??-1950)
Lived at 87 Alexandra Road until his passing in 1950 (2)
Charles Richardson Knowles, an opera singer who performed with the Denhof Company and sang in the the Royal Opera House in the early 1900s: also in the Royal Albert Hall 1899-1901, 1906, 1919-1920 and 1925 Proms' concerts.
Charles Richardson Knowles
● Rosa Nouchette Carey (1840-1909)
Lived at 57 Alexandra Road in the 1870s-1880s (10)
A children's
writer - and as a novelist in the tradition of Jane Austen - her works reflected the values of the age and
were thought of as wholesome for girls. Her book "Nellie's Memories" sold over 50,000 copies!
She was brought up in London at
Tryons Road, Hackney, Middlesex and in South Hampstead. She was educated at
the Ladies' Institute, St John's Wood, where she was a contemporary and friend
of the German-born poet Mathilde Blind.
Miss Carey lived with her niece, nephews and two servants. The poet Helen Marion Burnside came to live with her in 1875 and stayed there until at least
1881 (Census).
Rosa Nouchette Carey © The National Portrait Gallery
● Catherine
Amy Dawson Scott (1865-1934)
Lived at 125 Alexandra Road.
An English writer, playwright and poet who in 1917, founded the To-Morrow Club, which aimed to draw the "writers of tomorrow", i.e. the "literary youth", and connect them with established writers to exchange ideas, advice, and comments.
Dawson Scott would sometimes invite the literary agents and editors she knew to attend dinners, while encouraging the young writers to meet them.
The dinner meetings-cum-lectures soon became a weekly event at 125 Alexandra Road.
Among those associated with such meetings were John Galsworthy, May Sinclair, Radclyffe Hall, Vera Brittain, EM Forster, WB Yeats, Joseph Conrad, HG Wells and George Bernard Shaw ...
She is best known as a co-founder in 1921 of English PEN - which stands for "Poets, Essayists, and Novelists" - one of the world's first non-governmental organizations and among the first international bodies advocating for human rights, and the founding center of PEN International, a worldwide association of writers.
In her later years she became a keen spiritualist and founded “The Survival League” with Desmond Shaw in 1929. She joined the International Institute for Psychical Research in 1934.(11)
Catherine Amy Dawson Scott
● Joseph Charles Holbrooke (1878-1958)
Lived at 55 Alexandra Road
A composer, conductor and virtuoso concert pianist who was quite well-known early in the 20th century. His son was the legendary
English bassoonist Gwydion Brooke. This was his address between 1940 and 1958, when he died. (13)
Joseph Charles Holbrooke
Others:
● 32 Alexandra Road
● 70 Alexandra Road
Lived Miss
Garden, a pianist and organist also associate of Trinity College.
● 81 Alexandra Road.
Lived Miss Streetly-Smith, editor and associate of the "Hampstead News".
● 105 Alexandra Road
Right next door to 103 (Leighton House) lived William Lobb (around 1900). A wealthy craftsman who made footwear for the British and European royalty and the well-to-do. He had a
shop in Regent Street, also at 9 St James
Street, presently at 88 Jeremyn Street - King Charles III is known to be a fan of Lobbs' shoes.
Incidentally, William's father - John Lobb - was King Edward
VII shoemaker (...) (12)
● 111 Alexandra Road
Miss Pratt ran a school for "daughters of gentlemen" here around 1883 (5)
● 112 Alexandra Road
Lived Miss Stanley-Lucas. A
member of the Royal Society of Musicians and Associate of the Royal
Philharmonic Society who also sang with the North London Orchestral
Society (3)
The list goes on ...
● Last but not least, Jane Belmont, "who claimed to have been the last mistress of King George IV, in his last years", is said to have lived in Loudoun Road - a perpendicular to Alexandra Road - "where she gave elegant parties and teased her young admirers with stories of the royal favour she had enjoyed."(6)
● Another resident in nearby Loudoun Road seems to have been Mary "Molly" Meers, "the daughter of a Leicester blacksmith, had become a
successful actress by the age of sixteen, but gave up acting for the
life of an adventuress.
She eventually garnered the protection of a
wealthy, widowed and elderly banker, who set her up in her own villa in
St. John’s Wood.
It is believed that many of Molly’s real-life
adventures were the inspiration for William Makepeace Thackery’s most
memorable character, Becky Sharp, the heroine of his novel, Vanity Fair" (quote/unquote)(6)
Mrs. Meers' house in Loudoun Road
St. John's Wood Memories' website
In sum, it
seems Alexandra Road was not, after all, a place
where the likes of Lillie Langtry would "never, ever, be seen dead" (...)
"The truth is rarely pure and never simple"
(Oscar Wilde in “The Importance of Being Earnest”)

Sources (abbreviated):
(1) https://jtrforums-research.org/resources/POD1888/a_streets.pdf"Commercial Gazette", 31 October 1894 also in the "Hampstead News" - both in the British Newspaper Archive. Also, F.T. Lott is recorded as still living St. Helier, Jersey in the 1850s namely at 33 Belmont Road. He exhibited in London from 1852 to 1879.
(2) "Hampstead News", 26 October 1950 in the British National Archive.
Also: http://operascotland.org/person/7619/Charles+Knowles
And: https://catalogue.royalalberthall.com/Record.aspx?src=CalmView.Persons&id=DS%2fUK%2f1628. Also screenshot below:
(3) "Hampstead News", 28 June 1900 in the British Newspaper Archive.
https://www.concertprogrammes.org.uk/html/search/verb/GetRecord/5049/
(4) "Hampstead News", 22 December 1904 in the British Newspaper Archive.
(5) "Hampstead News", 18 October 1883 in the British Newspaper Archive
(6) "St. John's Wood - An Abode of Love and the Arts" (reference below)
Also: https://regencyredingote.wordpress.com/2013/05/17/st-johns-wood-the-naughtiness/
(7) https://jtrforums-research.org/resources/POD1888/a_streets.pdf
(8)
(9)
(10) https://www.camdenology.org/names-beginning-with-the-letter-c/
https://victorianfictionresearchguides.org/rosa-nouchette-carey/
(11) Wikipedia, https://en.wikipedia.org/wiki/Catherine_Amy_Dawson_Scott
https://www.dulwichsociety.com/the-journal/summer-2024/catherine-amy-dawson-scott-1865-1934
(12) Wikipedia:https://en.wikipedia.org/wiki/John_Lobb_Bootmaker
Other references:
"The Marlborough House Set" - Anita Leslie - Doubleday
"Lillie Langtry: Manners, Masks and Morals" - Laura Beatty - Chatto&Windus,
"St. John's Wood - An Abode of Love and the Arts" - Stella Margetson - Home and Law Publishing