We really had a nice holiday in the beautiful Naxos, the Kostas' house is located about 3 km from the main town of Naxos, so it is close to the city but in a very quiet location. A car (or other means of transport) is recommended to facilitate travel around the island.
The mother and sister of Kostas were very kind and helpful, the mother welcomed us with a delicious homemade cake!
The house is optimal to comfortably accommodate up to 4-5 people, the apartment has new furniture and was really very clean.
In conclusion, Kostas' house is highly recommended.