We stayed for 2 nights and we have pretty much only good things to say about the place. The room was spacious, clean and had all you can ask for. The wifi was good, which in the part of the world (I'm from Sweden) is not always a certainty. The shower had a light show when used, which alone should be worth a trip to Naples ;). I must however point out that the apartment is in a rough neighborhood and the walks home at night can stress some people out. We had however no problem walking the streets and we were out pretty late.
All and all, this is a room we recommend using when in Naples!