The place has most of its value due to its location. It is at one of the best regions of Napoli's old city centre surrounded by nice restaurants and a safe and lively atmosphere. The place was also quiet and had an air conditioning system, which was a bonus for my stay during summer.
The view from the terrace is also nice, but beware that in order to get there you need some special moves to go up a ladder foxed on the wall and simultaneously open a door on the ceiling...
However, if you are looking for comfort more than location I would not recommend it due to the following reasons (also supported by previous reviews):
(i) There is no real WiFi, only an old portable router that never charges (and when connected, the internet is extremely bad) - my problem was not only the absence of WiFi, but also the fake advertisement of free WiFi 24/7.
(ii) The ceiling is quite low in the bedroom (but still ok for me with 1.8m, you just have to be aware to keep your head down)
(iii) THE BIGGEST PROBLEM: The ceiling in the shower room is even lower and taking a shower was a daily pain. I had to crouch in order to do it, which makes it a peculiar (and rather unsatisfying) experience.
(iv) Maybe it's a summer thing but there were small ants all over my room and sleeping with them on your bed was also very bad...
(v) The mattress is quite hard and it might be a matter of taste but I did not find it comfortable at all.
Final verdict: Go for it if you are a hobbit-sized person (or one that doesn't mind crouching to shower) and/or if you are looking for a quick stay/sleepover in Napoli at an excellent location. Otherwise, I believe you can find better options for your money and comfort :)