You reach the Guest House by bus in about 10min from main station. It's located at the crossing of two busy streets, so it was very loud at night.
When we came back from dinner at about 21.30 there have been standing prostitutes along the street. I've been staying in Florence with my boyfriend but we did not feel very save in the area of the Guest House.
In the room it was very hot and fuggy even when it was not that hot outside (ca. 25 degrees). Because of the noise from the street you could not open the window to get fresh air. There was a small fan in the room we used all night to get a little bit of air.
There are two bathrooms on the floor which were not very clean and often occupied because of the other guests. The walls and doors are pretty thin, so we heard the other guests all night talking and walking to the bathroom.
All in all we didn't sleep that well and would not come back. For those who need a comfortable place after a long day of sightseeing I would not recommend it.