First things first: Google maps and other GPS systems might send you the the wrong address, about 150 meters down the road. The apartment is on Via del Ponte alle Mosse, between Via Delle Carra and Via Pierluigi da Palestrina.
Having said that, the place is an absolute treasure and we’ll definitely come back again to stay here! There’s a bus to city center right across the street, though we always just walked the 15 minutes. Alessandro and his daughter went out of their way to make our stay as comfortable as possible, and the rooms are incredibly nice. We couldn’t have found a better place in Florence!