If you planned to go to Florence, I would definitely recommend Maria's flat. Perfect location. You are literally 5 mins walk from the so-called "religious centre" where Giotto's bell tower and Brunelleschi's Dome stand. Accomodation is spot-on and the surrounding area is quiet. I used to get back home late in the night, but I have never experienced problems of any sorts in terms of safety. I've never used public transports either, as the city itself isn't that big. Lovely stay ;-)