Buongiorno,
Here are two suggestions in the city center:
https://www.florenceaccommodation.com/villa-antea.html
https://www.florenceaccommodation.com/il-palagetto.html
Or you could look a bit on the outskirts, and save the trouble of parking in the center:
https://www.florenceaccommodation.com/la-paggeria.html is actually pretty close and has public transport nearby.
Buon Viaggio,
Donna Scharnagl