Overall: you won't regret booking this Airbnb, we had a fantastic stay.
The rooms and apartment itself was fantastic. Beautiful, spacious, well decorated, clean, new appliances; we've stayed at the St. Regis Rome before and we thought Simone's apartment was better.
The neighborhood has a local vibe and there are plenty of good restaurants and bars within a 5 min walk. However, do some research beforehand and where you want to go: if it's you're first time in Rome and you're only here for a couple days, it might be better to stay in a more touristy area like the Spanish Steps.