It was incredible staying at Gianni's place with my girlfriend for our couple of days in Naples. The place is quite spacious, with everything you need, and is located right in the main street of the city, though just a couple of blocks out of the busiest part. That makes it quite comfortable.
What's most special about this place, though, is the warm hospitality of Gianni and his mamma, who came in both at our arrival and departure offering coffee and being very friendly and helpful. They were flexible about our arrival, and also kept our luggage for some hours after the check-out while we went to a museum. They live right next door in the same building, so they're very available.
I strongly recommend this place for a great cost/benefit ratio in central Naples, very well located, and with a great combination of independence/privacy and the Neapolitan hospitality.