The location of the apartment is excellent - easy walking distance of both Napoli Centrale and the Centro Storico. Also, Vittorio is a really nice guy and his communication was great. Even when the washing machine broke, he did his best to put it right and let us use the neighbour's washing machine.
I understand that it's in an old building, but we felt that the apartment could have been cleaner and better maintained throughout - it was a little rough around the edges. For example, we needed to buy washing up liquid to clean all utensils before use, and the shower needed a deep clean.
Overall, the location was perfect for our stay but the apartment did not feel like good value for money - it was the most expensive place we stayed during our time in Italy and by far the worst maintained.