Marco is a very nice host. The apartment's location is great. It takes just few minutes walking to the main attractions from the apartment. It is very lovely and cozy. The kitchen is well-equipped. We had a really good time in Firenze.
Only one suggestion for getting to the apartment: although Google map says that it takes 18 minutes to walk from Firenze S.M.N. train station, it may take more than 30 minutes if walking with luggage (because of the stone sidewalk). So taking taxi would be a easier way to the apartment from train station.
Overall it's a very good apartment. I would recommend to others going to Firenze to stay.