I stayed in Florence a few years ago and thought the AirBnB I found was great but Massimo's just blew me away! The location is excellent for getting to anything you want to see in Florence and the view of Il Duomo from the private balcony is amazing, especially at night with a glass of wine!
Massimo was also really accommodating for our trip, welcoming us upon arrival (with a bottle of local wine!) and able to give us some flexibility in check-out to align with our travel plans.
Highly recommend the flat, the view and the host!