Manuela's place was very nice, the apartment was large and well furnished. For our trips to Ercolano and Pompeii we were able to use the guide books that were already in the apartment! Manuela also left us some basics in the fridge, pastries, and a huge bowl of fruit! All in all a great host and a nice apartment.
The only main issue we had was the area around the apartment - although it is very convenient to be close to the train station, it did not feel safe until you were inside the apartment. We had one attempted pick pocketing during our daily walk to/from the apartment to the train station, and would probably stay in a different area of Naples in general if we were to return.