Great stay in Florence! The location of the apartment is amazing, very convenient to walk around Florence, but so calm that you can have a good sleep. There are very nice touches in the apartment and it is very well equipped. Hosts are also very nice and responsive! They gave us all the infos regarding parking possibilities in the area.
We left our car outside of Florence at Villa Costanza parking (7euros/day) and took the tram to the apartment, which was very convenient.
The only slightly negative parts are that the bed is very hard, in case that's a problem for you, as it was for one of us, and that the heating system is automatically set so we couldn't touch it and would have liked it to be slightly warmer at specific moments, like breakfast time.