This is a really nice place to stay in Napoli. The hosts work in the cultural field. They are very kind and make you feel right at home. They love to cook local dishes and are happy to let you taste the result. The sleeping room is ok, with your own private toilet and shower and a personal roof terrace. There are a couple of other friendly people who rent a room in the house long term. They all speak reasonably to very good english.
The house is easy to find, very central to the most important streets and squares of Naples, and right next to the Historical Center.
The bedroom is next to the kitchen/living room which means you do hear it sometimes when people have conversations late in the evening, even though they don't speak loud. For me it was no problem.
I would certainly recommend this place.