Good, well appointed place, excellent for short stays. Walkable from the train station, as well as the metro and has a supermarket right opposite if you wish to pick up groceries etc. The apartment has a lift, and has facilities for cooking etc. You may need to look for a paid laundry outside in case you plan to have an extended stay. The building has a young kids club outside, and it can get a bit noisy on weekends.
Roberto picked us up at the station, and took us all the way home, as well as provided maps, water and choco cookies for my kiddo!
He gave us really great advice as well, which we followed and had an awesome time in Naples.