I stayed for a week in Giovanni's apartment with a friend. It was a great base to explore Naples and the surrounding area, only 10 minutes from the main station and on the doorstep of the old town with great restaurants and attractions. The roof terrace is a definite highlight - great for coffee and breakfast in the morning and wine and dinner in the evening.
Kitchen has basic equipment but if you want to do any serious cooking you might find it a bit lacking, this wasn't a problem for us though as we were very happy to eat prosciutto and fresh mozzarella when we wanted a night in.
Giovanni was excellent, responding to our messages quickly throughout the stay. Overall a great apartment for the price, I would definitely stay again if I was returning to Naples.