Carmines Apartment is perfectly located for a short stay in Napoli since you can reach everything within walking distance. The apartment itself is also sufficiently clean. It does not come with a personalized interiour but that's not really important since you wanna be out in the city anyway. The communication with Carmine was perfect. He also helped us find a parking space (10€ per day) since you can't really find a normal one at the packed streets.
The only minus we found about the apartment/location was the street noises during the night. The apartment unfortunately does not have a noise cancelling door; it's more a block of metal. So for all the motorbike noises and scooter horn enthusiasts among you, there shouldn't be a problem. Our night though was unfornately more a state of trance rather than a real sleep.