I had an amazing stay at Claudio's place. I would recommend his place to anyone wanting to stay in Florence. He was very organized and prepared about our trip. He was also informative about the tourist tax for staying in Italy.
When we arrived Claudio met us at the station and made sure we knew how to get into the house, how all the keys worked, and where the hangers and iron was. He also let us use his coffee and coffee maker and offered fresh towels to use. Most importantly, he gave us a free bottle of wine when we arrived :)
As far as the location goes, it is a nice walking distance to the main city, and close to the train taking you to the main railway station (Firenze SMN). If you want to take a bus into town, it's less than 5 minutes walk from his place. A laundry mat and grocery store are very close to his place as well.
During our stay, Claudio made sure we were doing okay by emailing us to see how our trip was going and if we needed anything. He offered many suggestions on things to do and updated us on the status of the Duomo when it was closed for a memorial service.