Gennaro's place is located in a nice, quiet part of town just a short walk away from the main streets. The apartment is perfect for two people, with a spacious living room/bedroom area and a bathroom with an amazing shower. There's also a kitchenette that is great for smaller tasks such as making yourself tea or preparing some panini before you head off for a day trip to Pompeii.
We stayed at Casa di Fabrizio during the week and it was consistently quiet during the night though some noise can be heard in the morning once local shops open. Additionally, if security is a concern for you, this apartment checks all the boxes with a gate that locks the balcony and an armored front door.
Gennaro was a great host. Even though we arrived in Naples very early he allowed us to drop the bags before the scheduled check in time and got us into the house even before the 2PM advertised check in time. He made himself available at all times providing us with great insight into where and what to eat. It was a great experience and we would suggest Gennaro's place without thinking twice.