Our group of 4 adults spent 2 nights in Naples. The apartment is centrally located in one of the old (historic) houses. There are little shops and cafes nearby. It has a characteristic courtyard, marbles staircase, and a very cosy elevator. The apartment is well equipped. The place has a very high ceiling (5+ meters), which allows for having two stores in the apartment.
You should mind a few things: on a 1-5 scale, the noise at night was approximately 4. The second floor contains another bedroom and bathroom. It was probably built by the owners themselves. The sound insulation between these internal floors is moderate. Also the air flow is limited as only a part of the window from the first floor reaches the upper bedroom.
If you travel by car, it may be a bit challenging to park in the street and unload your luggage. The paid garage (25 EUR per night) is located in a 5 minutes walk.
Overall, we enjoyed our stay.