My girlfriend and I stayed at this place for a week. Rafael and Anna are extremely sweet people. When we landed in Naples airport, it turned out that we had forgotten something on the plane, making us almost 2 hours late. Rafael waited outside the airport for all this time, so he could drive us to the apartment. At the end of our holiday, Anna got up and drove us to the airport at 7.30 in the morning. That's true hospitality.
Besides the good hosts, the apartment is also very good. Inside, it is furnished just as all the other ground-floor apartments in Naples, giving visitors a little slice-of-life feeling when staying there. The aircon works well, and we had no issues with any amenities.
Location wise, the apartment is also fantastic. The neighborhood is sweet and charming. One must be aware though, that everyone in Naples drives like a maniac, so you really have to watch out when walking around. Furthermore, it is quite a hilly area, so I wouldn't advise going there if you are troubled with walking. But us being two young people with restless legs, we found that everything we planned on seeing was within a 25 minute walk. For anything else, the nearest metro station is quite close, and so is the harbor (from where you can take day-trips to local islands).
Overall, I have no negative things to say about the place or the people who run it.