The flat is absolutely gorgeous. Tastefully renovated, preserving the old structures - if you love interior design you will love this flat. Roberto was a great host, communication was very easy, he provided helpful hints.
Anyway I have to articulate some warnings. If you are heading for a quiet place with privacy this should not be your first choice. The walls have ears. You can communicate with your neighbors and people passing by in the street without raising your voice. Your neighbor will hear what you are doing and vice versa. The flat easily provides room for 4 persons, but I would not recommend it for 2 couples!
In summary this flat is an absolute recommendation for a single person, a couple or a family. It has a perfect location and a perfect host. If you have no concerns with the above mentioned issues this is where you should go.