We recently stayed at Geraldine's place for four nights and it is an interior delight! The home is beautifully designed, well-appointed and had thoughtful touches that made us feel incredibly welcomed and at home. The location is just outside the historical district, which allowed us to escape the tourist crowds.
Niccolo and Geraldine are excellent hosts. Definitely ask for their recommendations on what to do, where to be/see/eat if it's your first time in Florence. Cannot recommend highly enough!