Riccardo was very kind, punctual, the appartment was as described. We gave us a bottle of wine and some pasta, the appartment very clean, well equiped, and at first not so easy to reach, but then we realized we were just in front of a bus stop, so you can be in 5 - 15 min everywhere. So thanks Riccardo, everything was great. The appartment is perfect for a little family (3-4 pers) visiting Rome.
The only point against was that the taxes are not included in the published price, so you have to consider an additional 3 euros per person per day. Besides that, everything was perfect.