We had a great time staying at Monica's apartment, which it was very close to ottaviano metro train station (4 mins walking). Near to St. Peter's basilica (5 mins walking) and to several restaurants.
The apartment was VERY clean and exactly like the photos!! We checked in nearly at 10 in the morning and late checked out close to 6 in the afternoon. ( Monica told us she hadn't got problem staying few hours more which it was helpful cause our flight was late the same afternoon).
I strongly recommend Monica's apartment and I will check in again in that place if I will have the opportunity!
Ps the communication between us was ok without having any delays!