The unit and building were nice. However, be forewarned...the apartment is NOT "in the heart of the city" as stated. In order to get to the "heart" of Rome one must either: take a 10 t0 12 Euro cab ride each way; or ride on an overcrowded (sardine can like) tram each way for 10-15 minutes; or take a less cleaner, overcrowded bus; or walk for 45 minutes (quick pace) or more.
If staying on a weekend, be aware of the fact that there is an enormous flea market each Sunday in front of the building and extended numerous blocks each way (to the right or left of the entrance) which is overly crowded and difficult to maneuver. The filth, trash and garbage on the street after this weekly event is discomforting, although it does get cleaned up afterwards, which cleanup takes a couple of hours or more with streets having to be blocked off by police in order for the cleanup to take place.
The neighborhood itself is strewn with a tremendous amount of graffiti on walls of numerous, numerous buildings and on business shutters. Not a pleasing sight. That's not to say the area is unsafe. If we'd known of this in advance we would have not booked the apartment. The pictures of the building's entrance and the restaurant which is housed at its base is not an accurate depiction of the surrounding buildings.
This is not an area I'd recommend, especially in light of the MISLEADING representation/description that it is in the "heart of the city" and the graffiti (which I have always found to be in less desirable areas of major cities, at least in the US).
My wife and I checked out a day early because of our displeasure. Every other unit we've booked through Airbnb in Florence, Venice, Madrid, Barcelona, Paris has been terrific. Not this one though.