I booked Marica's place on a whim when I came into town last minute. The pictures reflect accurately what the place looks like inside. Very clean, incredibly spacious. Best bathroom I have had in all of Europe. The bedroom even had electric blinds.
The cons are the neighborhood. I am a single female traveler and at night it was a bit nerve-racking but I never encountered any problems. I would not say this should stop anyone from staying here, just be aware when you are booking it so you aren't surprised.
For the price, comfort, and proximity to the train - this place is an excellent deal.
Lastly, Maria is an amazing host. She makes you breakfast which included cake her mother baked but which you swore came from a bakery. She gave me a map with some good spots to eat. And she responded to all my questions immediately. She is as good as a host can be.
If you plan to explore areas outside of Naples (Pompeii/Almafi) this is an excellent landing pad! I would stay here again happily.