The appartment of Giocomo is very nice, it has all the comfort you can look for. It is situated in quiet avenue, so your nights will be very calm.
The main part of Florence is next to San Marco (15-20 min from the appartment), so be aware of that when so choose where you stay.
For information, the check-in guy was psycho-rigid with me for 5-10 minutes, so be careful with your arrival time.