Its a small point, but I think I would remove the pulley for viewings.
yes, its a great thing to have and very practical. I totally see why you've done it ( I wouldn't be without my pulley). But for viewers coming to the flat its one of the first things they see as they step through the front door. It'ss an unusual place for a pulley ( in a public area) it immediately screams lack of space...
Its a lovely flat. The kitchen and bathroom are beautifully done, and the living room is gorgeous. A working fireplace is a lovely feature and should be highlighted. Can you dress it with a coal scuttle and some low emission coal/peat briquettes?
Communal back court, internal kitchen etc are not the problem - you're getting lots of viewers. Edinburgh buyers are very familiar with both these things. As a PP said, its something they see when they get there that isn't justifying an offer which might just be price.
Have you had any notes of interest ?
Good luck OP