This apartment is small, but has everything that you need for a short stay in the city.
The bed is comfortable, and it has a small kitchen area for preparing tea/coffee, or even some food if you want to. The apartment is also well air-conditioned and the bathroom, though a little old, was clean and functional.
Location-wise the apartment was situated well enough to access the historical centre (10-15 mins walk), though if you want to explore some other areas, such as the Spanish quarter, you will have to walk a little further (~25 mins) or take the metro, which is located very close to the apartment. It is also quite easy to get to the ferry terminal from the Airbnb, as you just have to cross the road and follow the line of the harbour until you reach it.
The hosts communicated well, and were able to recommend me some things to visit in the city, and which areas were of particular interest. I really felt like they wanted me to make the most of my time in the city, which was a nice beginning to the trip.
Overall, I would definitely recommend this apartment to anyone coming to Naples, as long as you are comfortable with a bit of walking!