We definitely recommend Paolo’s apartment. It is in the best neighborhood, and it is a joy to get to know Vomero and its cafes and restaurants better. The apartment is very close to the best Carrefour, a grocery store, as well as the metro, funicular, and other eateries.
The AC was broken while we were there, but Paolo provided two fans. Because the apartment is on the ground floor, the two fans were sufficient for us to feel cool and sleep easily. It is a bit damp inside the apartment, but the dampness may be better when the AC is working.
Paolo was a very hospitable host and kindly waited for us to check-in even when we had train delays and no cell service. We really enjoyed getting to know Napoli and then returning to cooler and slightly calmer Vomero after sight-seeing.