We stayed at Claudia's apartment for 5 nights. Claudia was a great host extremely responsive and helpful. We didn't actually meet Claudia but she arranged for her friend to meet us for key exchange and was really flexible with the time.
The apartment was exactly as shown in the photos. The apartment had everything we required, Claudia even left us a welcome basket of food. There are a few things to note about the apartment it can get very hot during summer (even with aircon turned on) because it is located on the top floor. Also as it is located on top floor, there are a some flights of stairs to climb. The electricity is very sensitive, in a sense that two major appliances cannot be used at the same time. Otherwise the electricity will cut, though we think this may be the case with all of Italy's electricity. This happened to us on our first night, Claudia's sister helped us restart the electricity and the problem was resolved quickly.
The location is also great, it is walkable to all mains sight and main train station for those looking to do day trips.
Overall, we had a great experience with Claudia and a fantastic time in Florence.