We just stayed a week in Walter's spacious apartment. It is in a great location in the Oltrarno area and close to many restaurants, bars, and sites - all within easy walking distance.
Walter is a great host and all our correspondence was quick. He was also at the apartment when we arrived to show us around and to offer advice on things to see and where to eat. Had good WiFi which was much appreciated, and there are also a number of books on Florence that you can use for learning about the sites. We had a great time.
Thank you for everything.