Our stay at Marco and Alessandro's place was amazing. We mostly dealt with Alessandro and he was absolutely great. He met us at the apartment to let us in (before check in too), provided us restaurant and other recommendations and was just incredibly helpful. We loved his enthusiasm for his city.
The apartment is almost exactly as advertised plus croissants and other pastries for breakfast and an espresso machine. They also had a bottle of wine waiting for us, a perfect treat for a couple on their honeymoon. The apartment also comes with a washer that worked well though you do have to air dry your clothes, which is typical for Italy. It does not have a balcony or patio, but you can open up full-height windows for an indoor-outdoor feel. It had the nicest kitchen we saw by far on our two weeks traveling through Italy and Croatia.
The location worked great for us. Incredibly close to the Cathedral and Naples' archaeological museum as well as to streets packed with restaurants, street-food vendors and stores. It was a longer hike to the ferry and to the non-industrial waterfront area, but we ended up walking everywhere and didn't feel like it was really that bad.