My wife and I had the pleasure of staying at Il Posesta Appartamento. I highly recommend you consider this place.
We first received excellent directions to the apartment, that got us there from Firenzie Santa Maria Novella train station without problems.
On arrival we were met and presented with a lot of delicious apricots from the region. A guide book was also provided for us which contained a lot of useful information. The apartment is registered as a hotel, so you will need to give them your passport to take a photocopy. It is standard policy in Italy, so it was not a surprise. There was a copier in the apartment, so it was done immediately and our passports were handed back.
We had an issue where the hot water was not working on the second day. I sent off an email, and it was responded to with someone arriving within 15 minutes. It required more work to get working, and a technician had it fixed for us after we returned from visiting Florence.
The apartment was really quite nice, with a queen double bed, kitchen and bathroom as described.
The area has some lovely restaurants and food supplies close by. A pizzeria about 100metres towards Florence was wonderful and we ate there every night we stayed there. Prices were very reasonable for what we got (about 30 euro for 2 people).
The buses leave fairly regularly, and are well marked. We had no trouble getting around Florence from this apartment.