Overall this is a great place! The location is fantastic, super centrally located and great walking distance to everything. There is a central door that has a keypad and then a lock to the stairwell and the actual apartment, so things feel very safe and secure.
Check in was a bit confusing because Airbnb is not updated correctly, so there were messages sent with a link to a document to get the correct address, and then door and key box codes in another message - ideally Airbnb will be fully updated so that everything is in the main listing in the future.
Only other issue we had is the first night there was a beeping that went on throughout the night. We think it was coming from the AC but couldn't pinpoint it. Nikitas sent someone over to look at it and they couldn't find the source of it, but it stopped for the remainder of our stay. The wi-fi went out at one point but we were out for the day so we weren't bothered by that.
Other tip for traveling to Naxos, having an ATV on the island was great, however we couldn't take all of our luggage in one trip, so either pack light or be prepared to make multiple trips to haul your stuff!