The house is amazing. It might be a bit too small for more than one person (for a couple should be fine though). The house is very simple. It's essentially a bedroom with a small bathroom. The kitchennete is tiny and hard to cook meals in. We only ever used it for simple salads, making coffee, toasts and handle take-away pizza.
A slightly worse note on the location. The area is very shady (compared to other areas of Naples). There are some shady people walking around and we saw the police breaking off conflicts at least twice during our 5-day stay.
Last but not least, the check-in was ok. Ferruccio is a wonderful person, and even though he speaks really few English, he's an extremely devoted person!