We had a wonderful stay in Florence. The apartment is very centrally located, clean and stylishly furnished. The bed was very comfortable and the air conditioning worked perfectly. At night it was sometimes noisy despite the window being closed, as there is a bar downstairs in the house. But we could live with it well.
Valter was very friendly, spoke good English and told us a lot about the city. I especially liked that he gave us a clear map and marked important spots of Florence. So we walked more relaxed through the city and had directly goals for the day. I also thought it was very sweet of Valter to carry my bag upstairs. That is not a matter of course.
Note: Read the fine print well. We were stuck in traffic for 4.5 hours and had to pay 20 euros for late check-in as a result, which annoyed us a bit.
By the way, if you're coming by car, plan on a 30 minute walk as the parking is further away. The cost is 15 euros per day. You could also park somewhere in the center, but probably for about 30 euros per day.
PS: If you have to eat gluten free like me, Florence is a paradise for you. :)