Very centrally located and clean studio apartment with a nice host, who is very attentive. It's got the basic facilities, although the kitchen is small if you want to cook. There is a nice view of Vesuvio and the city from the window.
On the downside, the apartment is a bit smaller than it looks, so for two people it is on the limit. We visited in summer and it gets very hot, so if you are not used to sleeping in hot temperatures maybe consider visiting this place from September to May. Finally, it is on the top floor with no elevator, so some physical effort is required.
But overall a decent and relatively cheap option close to everything.