My partner and I spent five nights in Pierpaolos apartment, and we both can confirm we would stay there again! We didn't get to meet Pierpaolo himself, but was greeted by Luca who was really helpful and friendly :)
We especially loved the location of the apartment, as it is situated in the interesting area centro storico, but also close to the metro and buses, so you can easily get around to other parts of the city. The apartment is located in a unique, old building with a really nice view. All the amenities worked, and when we had a small issue Luca quickly responded to help us :)
Will defidently stay in Pierpaolos apartment when we return to Napoli!