I was in the 2nd room (the one with loft) during 1 week. The flat and the room are really nice, large and everything was very clean as advertised.
The flat is ideally located if you arrive by train, and close to main attractions (10-15min Galleria degli Uffizi…). Isabella and her roommates were awesome, full of tips about the city (good spot, bars and restaurants). I spent a very good week there.