This is a very nice place in the historic centre, just around the corner from the subway Dante. It is bright and has 2 (!) terraces - one shared (overlooking Piazza Dante), and one private. It is fairly clean and in good state for Southern Italy, and it has proper heating (that is an important thing if you travel in the winter - many Neapolitan houses only have heat blowers that dry out the air, and leave the place cold as soon as you switch them off). Bedding was comfortable and sufficently warm (that is also not always the case in Southern Italy). There is also a private bathroom, as well as a shared and well equipped kitchen.
Keep in mind that you have to climb 106 steep and narrow steps, that the room is separated from a shared area only by a frosted glass room (you may hear noises and see light), and that the bed might be too norrow for two adults.
All in all, I enjoyed my stay very much, including the discreet and friendly presence of my host.