Nice small place, pretty basic, in a very noisy street but you'll see real Naples there! Very central, very close to Toledo metro station and to all the main attractions incl. the port.
Be aware that the apart is on the 5 floor and there is no elevator. Was not a problem for us, but was a bit for my mom who has knee problems.
Terrace is big and nice, but we didn't use as we only had a short stay and wanted to be outside as much as possible.