Barbara offered a very good price for a room in her apartment. Her place is close to 2 bus stops where you can take the bus to get to 2 nearby subway stations - Museo and Dante. Coming from Central Station, I suggest you take the subway/bus, especially if you have huge bags/suitcases. The map might show you the place is near, but you will be walking on cobbled streets (obviously because you are in Italy) and the building is in a higher area of Naples. I made a mistake by getting to her place on foot.
Check-in was smooth. I was greeted by Barbara's brother. The apartment is on the 3rd floor of a building with no elevator so I appreciated it a lot when he carried my luggage.

The apartment has 2 rooms and I shared the place with a couple but I exclusively used one of the bathrooms although it's not inside the bedroom.
I did not go out at night for most of my stay, but the area seems safe despite being a little away from the main street. I did not encounter bad or malicious people.