We were not very comfortable in this apartment. The place is like advertised, and indeed has a great view over Napoli and the Vesuvius. But due to the lack of airconditioning, it quickly becomes really hot and it is difficult to lose the heat. There is an old dusty fan but it doesn't help much (opening the windows at night resulted in many mosquito bites). We found it hard to cook as most kitchen utensils were old, sticky or otherwise dirty, or simply lacking (just 1 pan and 1 pot). The bathroom door could not close as it was too large, the shower is not physically separated from the living room, and some parts of the apartment smelled rather bad.
A few positives then: communication with the hosts and check-in was good, the view is beautiful, and the city center is quite close by. If you go from the city center to the apartment, we would recommend to take the Montesanto funiculare because it is quite a climb upwards!