We had a really nice stay at Anna's and Giovanni's apartment. Our room had a single bathroom and our own rooftop terrace. We shared the kitchen with the other, very nice and friendly people who live there. They were always helpful when we needed tips our balm against mosquito bites.
The apartment was clean and like a common students apartment. Everything is as described, just be aware that the apartment can get really warm in summer. We even stayed one night longer than planned which worked without any issues.
Next time in Naples we would definitely come back here.