I think Antonios room is one of the best you can get for this price in Naples. It was really nice to stay there and although it's a shared apartment, you have enough privacy. Except the missing shower curtain, everything was well equipped and modern. The bedroom seems pretty new and has everything you need, including wifi. The window is towards the inner yard and even if you hear the people living there during the day, in the night it's really quiet.
The area is probably not the nicest, and walking from the centro storico may make you feel a bit uncomfortable at first. But I never felt actually unsafe. On the other hand it's really comfortable to have the Garibaldi Central station in 5min walking distance. There is not only a metro station which connects you with both metro lines, at the station also departs the Circumvesuviana, so you have perfect access to go to places like the vesuvius, pompei or even sorrento.
So altogether i would definitely recommend staying here.