My review will be somewhat brief because not much needs to be said; Miltos was an excellent host.
His apartment was as described - modern, comfortable, clean, and in the perfect location. You can walk the entire city of Athens from there.
Where Miltos really stood out was in customer service. He met me at the Metro stop around 10:30pm on a weeknight to let me into the apartment and help me get situated. He explained everything about the apartment in detailed and showed me on a map where I should go and do in town. Miltos was extremely helpful with communication throughout the trip. In fact, my trip to Meteora would have been ruined but for the fact that Miltos advised me there was a Metro strike and I would have to get a taxi to the train station about an hour early because of strike-related traffic. I made my train with 10 minutes to spare and would not have made it without him. Finally, Miltos scheduled a cab for me to the airport at 5:00am on the day of my departure. He made the entire stay extremely easy. I would give him 10 stars if I could.