This is a very comfortable, nice, clean, spacious apartment in a great location. It's a walkable distance from the standard tourist areas (e.g. Spaccanapoli and the Centro Storico), but much nicer than actually staying in those very touristy areas. The nearby areas of Santa Lucia and Chiaia seem like "real" neighborhoods where the locals shop, eat, and spend time.
Marcello was great - he met us promptly and gave us very good tips about the local restaurants, etc.