Alessandro replied ultra fast. I had a problem at the airport and look for a place an extra day, and Alessandro replied in 5'.
The place is new inside and very clean. Super super easy to connect with the city (3 blocks from metro), the rest of Italy (3 blocks from main station) and the airport (2 blocks from the shuttle).
The neighbourhood might be a bit scary at the beggining, but nothing to be afraid if you know Naples.