The apartment is great - functional, clean and fresh. There's definitely enough space for 2-3 people. Air conditioning was working perfectly during our stay in August. Salvatore as a host was very helpful. He gave us maps of Naples and tips where to go. Location of the apartment is perfect. It's on one of the main touristic streets, but in it's quiet part. You can walk to many attractions of Naples in a few minutes. You can also get to/from main train station and port by foot - it's really not that far. If we had to mention one thing which was a little bit inconvenient, it would be little shower space.
To sum up, we definitely recommend MaSa Home - the apartment, location and host are top-notch.