This place is amazing. The apartment is cozy and very well equipped, it has even more features than the listing shows. Everything is new and well kept. We had an extremely pleasant stay.
The hosts, Luisa and David, were wonderful, kept in touch, very easy to reach and answered everything right away. They were very thoughtful.
The one thing I will mention is that the place is 15-20 min on foot from the city center, so depending on how tight your schedule in Firenze is I would advise considering renting a car or looking public transportation passes, or be ready to walk a lot.
I cannot recommend this place enough!