We never met Manos but his brother Kyriakos took care of us. He was a great host. He picked us up from the airport (they charge but it's worth it because of how far the Athens airport is) and showed us around the city and helped us get oriented. He marked up a map for us on the first night and briefed us on the cities and the sites. He was patient and enthusiastic throughout this process.
During our stay there were issues with the wifi in the apartment (not their fault) and Kyriakos spent hours on the phone communicating with the company on our behalf. In general, we felt very taken care of as guests. Also, the apartment is beautiful. While it is not in the center of the nightlife, it is not far from anything you will want to see.
Stay here!