This is a very beautiful, spacious apartment just minutes from the central train station. The location is very convenient, with easy connections to trains, buses, metro, and the airport shuttle. If you don't have long in the area and need to get around efficiently, I highly recommend it. Some nice trattorias and cafes nearby as well.
The apartment itself was my favorite place to stay for the duration of the month I spent in Italy. It was much bigger than I expected for Italy, and had a beautiful kitchen with spacious, new-looking appliances, and a washing machine to boot. It was up just one short flight of stairs (I actually hurt my back earlier on this trip and didn't have a problem with these).
Nice internet speed (also uncommon in my other Italy stays), and Paolo is great about staying in contact and offering assistance. He actually met us at the train station where we arrived and walked us back.
If I ever find myself in Naples, I would definitely stay here again.