Stefano and his wife were great hosts. Lovely people who were happy to help us in any way. The apartment is as described by other reviewers and accurately shown in the photos. It is a short distance from the metro and a 24/7 supermarket. Stefano's guidebook is really helpful - we especially enjoyed the restaurant recommended. Vomero is a nice area to stay with plenty of shops, bars and restaurants and a nice atmosphere in the evening every night. Plus as it is on a hill overlooking Napoli - great views.
We stayed in the first week of November when it was a bit chilly and the heating (for the whole building) was not yet available. I would expect that normally this is not an issue.
We recommend Stefano as a host and True Angel Apartment as a place to stay in Napoli.