My parents and I stayed at Claudio's place for a few days while visiting Naples.
The apartment itself is a bit old fashion. It is no doubt spacious and filled with amenities. However, I found a few issues with it as it first, does not come with wifi. It was not really a problem for us but it can be an issue for people visiting Naples without a phone internet plan. Secondly, it also may be a problem visiting in the summer as it can become hot and stuffy and the apartment does not come with a fan nor an air conditioner.
As for location-wise, it is slightly on the outskirts of the main attraction but close to a bus station. It is also close to various shops and a supermarket. It is roughly a 15-minute walk to Napoli Centrale and a 45-minute walk to the main city centre. A quick tip is that if you're travelling with family, a taxi may be more affordable and quick. However, the apartment can be a little noisy at night as it is close to a busy road.
In short, despite a few issues, I did enjoy my stay at Claudio's and for its price, would still recommend his apartment to anyone planning to visit Naples.