We stayed in Marco and Egidio's apartment for 6 nights with two adults and four kids. The apartment was perfect for six people. The kids used the large bedroom downstairs and we used the smaller bedroom upstairs.
The apartment is located in a typical building. The street is narrow and busy (as it should be in Naples), but inside the apartment, it's really quiet, with a nice view on the courtyard. The apartment is renovated not that long ago and whoever did it, did a great job. Both the organization and the quality of the materials used is perfect.
The location is perfect to discover Naples on foot.