This is a great apartment- very clean and has all you can need. It is as shown on the photos. The location is right in the city centre - close to the majority of tourist areas. It's close to the train station as well and the stop for the airport bus - only about 10 min walk. It's in the residential building but we've managed to find it while walking from the subway (after taking a few wrong turns).
Alessandro is a fantastic host - he replies very quickly to any questions and he does stay in touch with you throughout your stay to ensure everything is ok. We arrived early morning in Naples and we were able to leave our luggage in the apartment while it was being made ready for us. On leaving - we had a late flight and Alessandro kindly stored our luggage for us after the checkout. I would recommend staying with him and if I ever get back to Naples I will definitely use their apartment again.