Myself and 5 others (3 couples) stayed at Stefano's for 4 nights during the first part of our trip to Italy. To begin with, Stefano was easy to get in touch and communicate with, and extremely patient with our being 6 slightly confused tourists. He not only gave us clear directions on how to get to his house (which is not in central Naples but rather in a quiet, seaside area), but, in an amazing show of hospitality, when we finally arrived at our train stop late at night and the buses no longer seemed to be running, he actually drove out to find us and pick us up!
The house was incredible (to say the least), and the 6 of us comfortably shared it. We spent most of our time on Stefano's terrace, which is spacious and comfortable, with an excellent view of the surrounding area. The only thing I want to say here is to make sure you don't get a little too merry on the terrace because you have to be careful getting back down the stairs to the main house :)
The surrounding town is picturesque with very friendly cafe and shopowners. We did do quite a bit of walking, but you can easily make your way down the mountain using the nearby funicolare (tram) and from the bottom, walk to Mergellina station that connects you to anywhere you'd want to go, from Central Naples to Pompeii.
Stefano is an amazing host, and his house was an absolute pleasure to stay in. We were all genuinely sad when we had to leave and reminisced about it our whole trip. I can wholeheartedly recommend this place to anyone wanting to stay somewhere beautiful outside of the city, and can't wait to return one day!