The apartment itself is very cute and cozy. It has awesome location - Uffizi gallery is in few steps away. Next to the entrance door there is a nice restaurant. And it is rather quite on the street.
But the overall impression - you are not very welcome here.
Biggest issue is communication - very polite, nice, but complicated and gives feeling of fruitless. Also apartment requires some maintenance. Details below.
1) We arrived on Friday and had no internet connection. Problem was known for already three days but nobody warned us about this issue or tried to solve it in advance. When I contacted "owner" (well, not owner, see below) they said that the trouble solver is on vacation so my problem would be solved on Monday (I leave Florence on Tuesday morning). I had 5 contacts (sic!) in WhatsApp and AirBnb contacting me to bring a mobile wi-fi router on Monday. Truly thanks for solving the issue (helped a lot) but a) I had to push, b) I got contacted by so many people in English and Italian, c) it got solved rather late.
2) Well you would not reach real owner Edoardo E Michela. It's a whole team behind, having very restricted areas of responsibility (separate trouble shooter). I consider AirBnb as more person-to-person area. It's too commercial here.
3) There is no salt, coffee, sugar, tea, cooking oil, washing powder or kitchen napkins. AirBnb states you would have shower gel - well it's 2x20ml for two people for 4 nights (seriously?).
4) The teapot lost its spout somewhere. The freezer door is broken. The toilet seat is much smaller than the toilet bowl (I'd share the picture, sic!). No soap dish. The shower is broken. Electricity switched on and off by itself on the second floor. No duvet cover - you have a sandwich of ф blanket between two bed sheets.
5) There is a very narrow pass between the bed and banisters on the second floor. Not a big deal but a bit uncomfortable (just move sideways).
6) There is no noise isolation from upper apartment. Maybe due to age of the building. But you might hear your neighbors directly when you are in bed. You share thin and leaky floor/ceiling.
7) Very poor mobile coverage. Two lines for German Vodafone. Telefónica Deutschland was not available at all.
8) Usually hosts share a map or some recommendations on where to eat or what to see around. Not here. Not a big deal, just to complete the picture.