I had a great airbnb experience in Rosamavi. The apartment is clean, comfortable, has everything you need, and is well-kept by the host. Although located near Garibaldi (main station) it is very quiet in this neighbourhood and you can relax well from a day in the city or your excursions. The fact that you are close to the main station makes it especialy convenient for you if you want to get to Herculaneum, Pompeii or the Amalfi Coast by train.
Sergio is a wonderful host and although I have to say I have only made great experiences with airbnb, Sergio even topped it! He is very reliable, helpful and hospitable and communication with him is super easy. You can tell that he is interested in making his guests feel well in his apartment and that he is very passionate about being a great host.
I highly recommend this place for a stay in Naples.