I have nothing but good things to say about this apartment: it was great.
It seemed to be relatively recently converted and decorated as everything was in great condition, and the furnishings were stylish. The bathroom and kitchen were ideal - the kitchen seemed well equipped for cooking though to be honest we only used it for breakfast and snacks as there are so many great places to eat out. The air-conditioning was very welcome for us Scots after a day out in the Naples sunshine!
The location is ideal, just a few steps from Piazza Bellini which is a great place to have a spritz at night, and where there are places to eat. All the sights of the Centro Storico are within walking distance, and you are close to the Metro station at Piazza Dante and to the main street of Via Toledo. Although it is right in the centre of the centro storico action, it is as the listing says surprisingly quiet because it's up a few stories and the windows face into the courtyard not the street. I am a light sleeper but had no issues.
If you are a woman travelling alone and concerned about security then the apartment is very secure: a heavy locked gate from the street takes you into an internal courtyard, from there you go up the stairs where there is another heavy locked door into a nice shared hallway for three apartments (where the laundry room is), each apartment has it's own locked door.
Connie, the host who met us, was really lovely and very helpful with great communication. She gave us lots of recommendations and helped us with airport transfers.
I would be more than happy to recommend this place to friends or to visit again. A great choice in a great city!