I stayed here over a week and it was great location to explore Naples - close enough to walk to major point of interest but also close to the metro if you need it. Right in the heart of the old city so still felt 'authentic' but literally steps from supermarket, tribulani's pizza shops, and the archaeology museum (which is doing major renos, check before you go!). If you plan to take day trips out via train or Circumvesuviana, it is about 20 min walk from the station.
The space itself was great, very nicely decorated and though little natural light theres basically an entire lighting scheme to play with. The futon is slightly awkward as a couch but hopefully you're too busy exploring for this to be an issue. Being so central there can be quite a lot of noise, including neighbours dogs and scooters, and as the doors have a slight gap to the outside they don't block much - wasn't really an issue for me but light sleepers keep in mind. Ticks all the main boxes though and would definitely stay again