We were met by Andrea's mom who was the best! She didn't speak English (and we don't speak Italian) but for some reason everything still made sense! The apartment is perfectly situated and has a nice little covered balcony that we used all the time. It is very comfortable and everything you could possibly need is provided. The location is perfect - it is on a quiet street but still extremely close to all the sights of Florence (we could walk to the Duomo in less then ten minutes).
The only negative we had was that the apartment walls seem to be paper thin. We didn't hear much three of the nights but one night we could hear the neighbours (loudly) putting away dishes and talking at midnight. Of course there is nothing that can be done about that but it might be a consideration if you like lots of sleep...but you are in Florence so should be out late at night exploring anyway!
All in all a great stay!