We stayed for 2 nights in Florence. We self checked in a bit early then expected but Andrea was quite flexible and accommodative. Andrea's house is very beautiful and has all basic amenities including a washing machine and a TV (with Netflix). It has two good sized bedrooms with two double beds, one single bed and a spacious bathroom.
There is a secured private parking space but the entrance is a bit narrow. We rented a small Fiat 500, so it passed through it without any problem. The flat is on the 6th floor with a lift access. The nearest Tram station is 'Novoli-Palazzi Rossi' which is only a 2 min walk from the house and takes you to the centre of Florence in like 12 min. The 90 min ticket for Tram will cost you like 3 euros.
Overall a very nice experience and prefer to stay there again if get a chance to visit Florence.