I can only add that my wife and I, on arriving in Sheffield in 1979, moved into the attic flat at 21 Victoria Road, a large detached house now in a conservation area. The house owners (and residents downstairs) in our time were a couple of retired academics. I know their ownership did not go back anywhere near as far as the time when the house was part of the story told in this thread.
Quite likely we were in the servants' quarters, occupied by Florence Rosetta Charlesworth in 1911.