I highly recommend this AirBnB to anyone staying in Florence. It's so centrally located that I never had to take a taxi during my entire trip. The place was also very clean, and spacious--plenty of room for 2 people to be very comfortable. It was also nice to have a full kitchen and washing machine. The air conditioning was a life saver during the very hot Florence weather. Also, the bed is extremely comfortable and super soft, which is very rare in Italy!
This apartment is on a mezzanine level so you will have to walk up one set of stairs. Also, since it is near an event hall you may get some noise through the day or night (mostly the sound of moving furniture or the elevator near the door). So if you are a light sleeper then earplugs will be a good idea.