My husband and I stayed for a week at the apartment and we had a great time! Federico and Vittoria were perfect hosts and very responsive. The apartment is well located, 5 mins to metro and train stations, 30 mins to the ferry port and the Spanish quarter. Also plenty of great restaurants less than 10 mins walk away (see Federico's recommendation list)! Some nearby streets are a bit dark at night (most small streets in Naples are...), but if you stay on the main streets it's perfectly fine, we walked home past midnight a few times and didn't encounter any issues.
The apartment offers lot of space, the bed is very comfortable and all the amenity works perfectly. We locked ourselves out once by accident and Federico was quick to the rescue. Overall would recommend this place! Thank you again Federico and Vittoria!