What a great location! The apartment is in a really superb spot, in a non-touristy neighbourhood but still close to many of the attractions - a taste of the Neopolitan Naples!
Rosario is an excellent host, very responsive and helpful - he even offered to pick us up from the airport, which was terrific.
The apartment itself is well kept, if a bit on the small size - although there is a double pull out bed it is only really comfortable for 2 people, e.g. a small hot water tank if everyone wants to shower!
Overall, though, would recommend for sure.