I spent only one night at Maria Cristina's apartment during a week end visiting Firenze but I had such a nice time there! Maria Cristina is a charming host, very friendly and she gave me a lot of precious informations for my trip in Italy. The apartment is very clean, quiet and spacious, very easy to find. You have a bus just in front of the building to join the center or you can also walk it's not very far and very secure. ( I was traveling alone)
I recommend this place and will come back again if I go to Firenze!