Milly is a kind, responsive and enthusiastic host. Her apartment has everything you could ask for, particularly the AC (essential in the summer heat) and a washing machine.
The apartment is in a beautiful old construction, in a quite centrally located neighborhood, right on Piazza Cavour--this is extra helpful since it is directly on the transfer station (Piazza Cavour/Museo) between Lines 1 and 2 of the Napoli Metro. From the Line 2 Station (Piazza Cavour) there are half-hourly direct, express trains to Pompeii, and when the metro doesn't run, the Old City Center starts just across the street (you can reach anywhere in the Old Town within a 20 minute walk), and there is a taxi stand directly at the plaza in front of the Airbnb. While the neighborhood is pretty safe, the building is extra secure, and the flat has multiple locks, which certainly adds to the security.
Just as a random note: the apartment is on the 3rd [EU] /4th [US] floor, and the elevator requires a 20 cent coin to operate, except during evenings and weekends when it is free (if I remember correctly). While this is a nominal, tiny expense, I found myself often not having the exact change for the elevator..
In any case, it was a lovely apartment, and I even extended my stay by a week, which Milly happily accommodated. I couldn't imagine a better apartment in Napoli, and would recommend her place to anyone.