We stayed the flat about two weeks. Although we arrived the flat an hour late because of the snow, Carmine welcomed us warmly! While our staying, he replied the messages quickly. It was really help us!
The flat is very neat and tidy and location is nice. We could get Duomo in five minutes by walking. In this area, there are a lot of shops, bakeries with friendly staff...etc. My best favorite is Mercato Sant'Ambrogio. It's Smaller than Mercato Centorale, but more interesting for me!!
If you are planning to visit Florence, I really recommend this flat!
Thank you very much Elisa and Carmine!