My 3 sisters and I spent 6 days at Sofia's apartment. Her place is spacious, well divided and very clean. Location is excellent, walking distance of main attractions and still quiet. Also, is next to the lovely piazza Santo Spirito, with good restaurants, local stores and paid parking garage near by.
Sofia is a great hostess, very nice and welcoming, also accurate on her suggestions and guidance. It certainly made our time in Florence far more pleasant.