Go for it—and enjoy a nice little place to stay at with an awesome location!
The apartment is quite small, but everything was clean and well organised! A part of the ceiling is a bit low, but it's no problem to access both sides of the main room.
The location is ideal to enjoy Naples. It's close to a nice, living part of the center, in a busy street with many restaurants (some more touristic than others), but you can easily reach other neighborhoods from there. The metro is 10-15 minutes away by walking, and you can reach both the train station and the heights of Vomero from there! It's a bit longer to go there from the train station by walking, but nothing impossible if you don't loose yourself in the maze of alleys the center is made up of.
Given that Emilio's appartement is close to a busy street, there were a few noises from the outside at night, but it was very reasonable —jusr what you would expect from any city center. You may want to take that into account if you are very sensitive to such noises, but in our case it was perfectly fine!