Alberto welcomed us and showed the place, he gave us the instructions about the wifi (very good connection) and when and how to check out. The appartment is ideally located in the very heart of the old town. It looks exactly as on the pictures, the furniture is new and it's quite clean and well equiped. The flat is located on the ground floor of the building, there are 2 rooms: the bedroom has a confortable queen size bed and is next to a nice little bathroom, the other room comprises the kitchen and a sofa that can be turned into a bed. This room has 2 ceiling windows which is a little disturbing because those windows are at the ground level of a hallway where neighbours pass and sometimes sit to discuss. We saw them bend over to look at us which is a bit surprising when you don't expect it. Curtains or tinted windows would be a good idea to avoid this.
Another thing that needs to be mentioned is that there is some humidity in the appartement, you can smell it when you enter the room. We tried to ventilate as much as possible but it does not go away. We only stayed there at night time for 3 days, so it was not a huge problem as we got used to it. I suppose it can be a problem if you have asthma or some lung condition, otherwise it's manageable.
The contacts with Daniela were easy by e-mail or by phone, and her responses were very quick.
Trastevere is the best place for restaurants and night life and this appartement is close to everything and is very quiet at the same time.