We have had a great stay in Ilaria's appartment! Ilaria picked us up from the station and told us the most important things to do and see in Napoli and we could contact her any moment when we had any questions.
The appartment is spacious, clean, modern and very well equiped (kitchen, air-con, free wifi, washing machine, nice shower). It is located at walking distance from the central station, port and (historic) city center.
As mentioned in another review you should be prepared to walk a couple of stairs as the apartment is at the 4th floor. But if you don't want to walk stairs or go uphill I guess you shouldn't go to Naples at all ;-)
We would definitely recommend Ilaria's apartment for your stay in Napoli!