I had a great one month stay while working online from Nikitas and Maria's apartment. They are exceptional hosts who always respond promptly to any questions, and they also live in the same complex, so you'll see them around. I really appreciated the pick up and drop off at the ferry port, and the random chats in the evenings. They have lots of tips about Naxos and surrounding islands.
The flat is nicely decorated and looks just like the photos. The wifi is fast. There's a shop with everything you need on the corner. I would definitely recommend this studio.