But I'm interested in how to interpret the detail of the advertisement. These days the property is listed as a 5 or 6 bedroom house with 3 bathrooms. Assuming similar then, this would seem to imply that he would have been just one of several people lodging there?
And would the 'fine front room' mentioned imply that this space was at the front of the house? Would 'full board' imply that there was a live-in housekeeper or landlord/landlady?
Looking at the history of the premises though newspaer advertisements.
It was a boarding establishment from as early as 1908. The house name was Normandy
https://trove.nla.gov.au/newspaper/article/238097669 Glancing through the papers using the address of part of it, there are lottery wins, marraiges and deaths for people who lived there over the years .
Example. One of many.
1945 Mr Jones lottery win
https://trove.nla.gov.au/newspaper/article/263371331 A bridegrooms mother’s address in 1943
https://trove.nla.gov.au/newspaper/article/179257864 The landladyin 1929 was Mrs Withers.
Her advertisement is clear in what was offered.
MANLY
AVOID THE COLD WEATHER!
Comfortable Boarding Establish
ment, 1 minute from Surf and Boat.
Good ' Table. Winter Terms.
"Normandy," 5 Darley Road.
MRS. N. WITHERS, Proprietress.
Tel. YU 2585
From the expression Good Table we infer 2 or 3 meals per day.
Lunch (sandwich etc) for a working man may have been provided also at extra cost.
I found no further reference as the name Normandy after 1934, but the establishment was a divided accommodation well after that
Seems to have declined in terms of fine lodgings by 1983

Still divided into Separate units in
1983https://trove.nla.gov.au/newspaper/article/231362731 DISORDERLY HOUSES ACT, 1943
IT is hereby notified that the undermentioned premises were,
by order dated 10th June, 1983, declared a Disorderly House
pursuant to section 3 of the Disorderly Houses Act, 1943:
Unit 28, 5 Darley Street, Darlinghurst;
Unit 33, 5 Darley Street, Darlinghurst.
(8746)
E. S. SHEPARD,
Detective Inspector of Police.