We had a wonderful stay at Michele´s: the flat has an amazing view on the Duomo and all necessary equipment. The bed is very confortable.
It is located ~30min away from the airport in tram, ~10min from the city station and 10-25min by foot from Duomo-Pitti/Boboli. There are also excellent restaurants nearby.
Michele was very available and was flexible regarding our arrival and departure times.
I would stay here again if I were to come back to Firenze !