I strongly recommend to stay at Claudio's place if you visit Florence!! I would like to stay at the same place if I go to Florence again. Everything was great, and the stay at his place made our trip very comfortable. Denis, Claudio's friend, waited for us for the checkin. He gave us many information about the apartment, sightseeing spots, and local places etc., which were very helpful for enjoying our trip! He said to us, "Don't try to fix things by yourselves. I am living close to here. Just ask me anything!". This word made us relax. Also, Claudio's mother visited us in the evening on the first day. She was so warm and kind.
Not only people at the apartment, but also the apartment, access to the station and every sightseeing location, security were great!