Great place to stay! We were only able to stay one night, but it was in the perfect location. Make sure to ask Sergio for taxi referral for the airport. It should only cost around 20 euros. Sergio gave awesome recommendations for things to do. Definitely check out the catacombs and Ovo castle! Everything is within a 15 to 30 minute walk. The Naples central train station is also only a 10 minute walk. The area is very safe. My wife and I never felt uncomfortable anywhere we went.
The room - There is a small narrow staircase up, but we packed light and Sergio helped us with luggage. May not be the best if you have young kids with you. It can be loud during the day, but at night it's very quiet. Everything was clean and easy to use. We didn't spend much time in the room though.