I highly recommend this apartment! It's a very cosy and functional place in a typical building. The location is very convenient with the metro station nearby and the historical centre easily accessible by walking only a few minutes. The marina Molo Beverello is also very (very!) close, so it is easy to get to the beautiful islands surrounding Naples by boat. Manuela was very helping and really easy to talk to. She was always available to make sure my stay was a success.
On my last day, the wifi was quite weak but I'm sure it was an exception because it was otherwise working fine during my whole stay.