We stayed for 4 nights in Roberto's flat. He is super fast in answering, gave us an excellent description of how to get to the flat from the airport and loads of great recommendations where to go and eat - at non-tourist places. He offered us to check-out later so we did not need to stow our luggage which saved us the hassle and time (thx again!!).
The flat's location is superb: it is right in the middle and you can walk to everything within 20 minutes, or just take one of the many busses 20 meters away from the flat.
The flat itself is very clean, not big but and has all that you need. It looks exactly like on the pictures. The bathroom is a bit small but works just fine for two people. We particularly liked the style of the flat and the attention to details.
We definitely recommend this flat and will come back!