The apartment is located conveniently close to the train and metro station. It is a very charming place with tall ceilings and nice furniture and the hosts were very communicative and hospitable. The place is on a side street and has decent windows so it is fairly quiet especially for Napoli standards.
The apartment is best suited for short stays, as there is no real kitchen and one of the double beds is actually in the living room. For a group of 4 staying an extended weekend it was completely fine. The missing star is due to issues with hot water on the shower which our host unsuccessfully tried to fix - since it was week end no plumbers were available either.
If you come by car this place is a must as it coms with a parking spot!!