We agree with everything that has been said by past guests who've been lucky enough to stay at Marietta's House. Lovely apartment and the spectacular view of the port from the terrace. No complaints whatsoever about the accommodation.
We also loved the central location in Chora, a few minutes walk and you are in the old town with its narrow alleys flanked by amazing shops, bars and restaurants, and a ten minute walk up to the Portara, the great marble gate from 530BC, the symbol of Naxos and where Apollo's temple was to be built. The public bus station was also nearby and we used the bus to travel way up into the mountains to the enchanting village of Chalki, blown away by the incredible scenery along the way. Two elderly Greek ladies next to us kept blessing themselves as we rounded sharp bends, which made us smile. An outstanding lunch followed at Giannis Tavern in Chalki's town square. Go for the pork roasted on the spit. One plate to share between two people is quite enough, as the servings are big. It was a top day, all for the princely sum of 5 Euro per person return bus fare. No need to rent a car.