The place is very tiny but clean and the location is perfect. There is a great view from the window, you can see the Vesuvio and feel the atmosphere of the city. Giovanni is a very friendly, flexible and helpful host.
On the downside the apartment gets hot very fast, and there is no AC. It's on the top floor so you have to climb a lot of stairs and it's not easy after a whole day of walking around the city ;)
I would recommend this apartment for people traveling solo because it's a really tiny space.