I made a same-day reservation for this room. Four single beds, one bigger bed, a private bathroom, and very importantly, some silence. Outside the building there's a small piazza that is noisy late into the night, but Il Borghetto has a balcony that faces a quieter street.
The host is very attentive and responds quickly, and genuinely cares about your stay. Unfortunately we didn't meet face to face.
The entire place was as clean as clean goes, the kitchen was well stocked for breakfast (whether an American breakfast or an Italian colazione), the location was extremely convenient (in the middle of the historical center and a short walk away from buses), and the other guests I met were nice.
Two things to note: the check-in process is a fun puzzle, and there's a few stairs to climb. If you have much luggage you may need some help or a couple trips, and you may need to read the check-in instructions a few times.
A great stay. If there's four or five of you (or less!) coming to Naples, do yourself a favor and book this room.