Giovanni's place is really nice and cozy, it has everything needed for a shorter stay (for 2-3 people, if 2 are a couple), and it's located very conveniently-- very close to the main train station and almost in the heart of the old town. The apartment is spacious and the roof terrace is simply amazing! I can imagine it being even nicer in summer, as we had a changing spring weather.
The area around it is very lively, although the very few streets around the apartment are quite calm (and somewhat secluded). If you are very keen on calm and tidy town parts, this might not be your first choice, but if you wish to experience the lively spirit of the old town of Naples, I would say it's perfect, as it brings you right into the center of the crowded, loud and incredibly colorful and multicultural face of Naples. There might be fancier and more glamorous parts of Naples, but this area is definitely more interesting!
Giovanni was a great host, very responsive and helpful, and he was always answering the messages promptly. I especially appreciated that he helped us with booking a taxi back to the airport, as we were not certain of how to do it ourselves. I definitely recommend Giovanni's place for a stay!