There's no easier spot to stay if you're coming to Naxos by ferry. We walked a few feet, and boom, there we were. Christos and Nancy have a beautiful little second floor walk-up with peekaboo views of the harbor, a private balcony, and the most delightful ability to people watch in the beautiful historic marketplace. Nancy was wonderful and gave us a tour of the apartment, recommendations for the area, and was easily accessible our entire stay as she has a shop 2 doors down from the apartment.
Other reviews mentioned the need for earplugs, which we did not experience. So long as you've adapted to the cultural day (i.e. eat dinner around 9pm, etc), you won't find this spot to be loud at all. It's away from the restaurants, and above cute little artisanal shops.
We had everything we needed: wine bottle opener, spare outlet adapters, hangers in the wardrobe, a full kitchenette, and local area resources like the bus timetable and route maps.