Gianni is very friendly and helpful. He was a good host, nice, available and hospitable. He knows Napoli very well, so he'll give you very good advices about places to visit, where to eat (well and cheap) and what to do for the nightlife.
The apartment is nice and incredibly well connected. It is in the centre, in front of Duomo, and you can get everywhere just by walking. Exactly in the same street there are some of the best pizzerias and restaurants of the city, but also cafes, bakeries, shops and very near one of the coolest areas to have a drink. I absolutely recommend that place!