Marco's place is all you can ask for, and more.
Perfectly located, about a 7 minute walk from S.M.N., and 5-10 minutes from all other main attractions in Florence.
It's in the livelier part of Via Faenza. There is a pub just under the house, so it can get noisy if you leave the windows open.
We had an absolutely great time in Marco's apartment, and would definitely recommend it to visitors to Florence.
Check in was absolutely smooth, we called Marco when we got off at S.M.N, and he was waiting for us under the apartment. Once we got in, he showed us around, explained house rules, and then gave us suggestions on restaurants and other attractions.
Great guy, and GREAT place.