This is a simple, but completely satisfactory, place to stay while in Naples. It was wonderfully quiet at night. It is on the edge of Spaccanapoli, which has so many inviting restaurants and shops and late-night vibrancy, and also close to the more modern shopping areas, and within reasonable walking distance of the Piazza del Plebiscito and Museum of Archaeology. In our 5 days here, we never had to use transit, except for taking the funicolare a couple of times. But transit is nearby if you choose.
There were two of us - and for us, the place was more than large enough. If more people are staying and using the sofabed, it might feel a bit cramped.
One caveat - while the apartment itself is all on one level, it is not that accessible for people with disabilities, since it is half way up a "rampe", or stair-street. Our taxi had difficulty finding the place on arrival, and had to be directed to the right location.