My brother and I stayed at Davide's apartment for 5 nights. It was conveniently located in a safe area very near Piazza Garibaldi metro station and Napoli Centrale station (about 5 mins walk). Good restaurents nearby and a mini mart just across the street in case you need anything. It was just a 10 to 15 min walk to the old town area.
The bathroom was great! Hot water always readily available and the water pressure was strong. Detergent was also provided for the washing machine as well as a huge clothes rack to dry your clothes.