I had a great stay at Guido's apartment. The place is very close to the station and also a very close walk to the central spots in Florence. I checked in at 9 pm and Guido was waiting for me at the apartment and gave me all the information about the room and nice suggestions of where to eat. The apartment has its' own bathroom which was nice and was very clean with a comfortable bed. There might be some noise on the street but it didn't bother me. You might want to bring earplugs if you are a light sleeper.
I would definitely stay at Guido's apartment again next time I am in Florence.