The apartment is just as described and was ideal for myself and my husband for our 4 night stay. It is clean and stylishly decorated. It is on the 5th floor with no lift but this was clearly stated beforehand and it didn't bother us at all.
Lorenzo answered any questions we had promptly and the arrangements for check in worked smoothly. We didn't do any cooking in the apartment as there are so many places to eat out close by but the kitchenette looked well equipped.
The highlights for us were the roof terrace and the location; Trastevere is a great area with lots of lovely piazzas and friendly bars and restaurants. Also, we were able to walk to most of the sights we wanted to see.
Ironically, the only downside is connected to the location! There are a lot of bars on the same street which serve until late at the weekends. My husband slept through this but I found it noisy on the Friday night we were there.
Overall I would definitely recommend the apartment.