The apartment looks as described and is quite stylish. It was extremely clean and chic as described and met, if not exceeded, out expectations. The location was also great next to plenty if non-touristy restaurants and the apartment is also located right above a bar and pizzeria. We were also informed that the building itself is from the 6th century but you would not have known that based on how beautiful the apartment is. It is a short distance to plenty of photo-worthy plazas and monuments and is very close (10 min walk max) to Rome Termini train station.
Valerio's apartment is managed by the family so we corresponded with both the son Valerio and his father who checked us in. The father was so very helpful with local tips and also extremely patient as our check-in time kept being delayed because of cancelled trains etc. (Italy is infamous for delayed trains). Otherwise, the father was very nice and I would absolutely stay here again.