Michèle is a lovely and great host, I definitely recommend to stay here and be her guests.
We've been a group out of 4 persons.
She reserved also a parking garage for us (29€ per night), which allowed us to enter the "Limited Traffic Access Zones" by car.
Small problems where fixed immediately. We did not found the button to activate warm water (Michèles daughter showed us where to find it) and Wifi was not working on the second day (we received a password to an new Wifi).
The flat is is in the middle of Florence and everything was in walking distance (even to Piazza Michelangelo it took us only 20 mins).
Overall: Great experience, definitely a recommendation!