I had a great stay at Mauro's place. He was an excelent host, gave me some directions and a map of Florence. Moreover, he was also willing to help with any doubt or request.
The bedroom was small and simple, but very clean and the bed was quite confortable.
Travelers carrying a big suitcase must be advised that the apartment is located around 15 minute walk away from the main train station and it's in the second floor of a building with no lift. Other than that, the location is really good.