Barely three stars. I really wanted to like this place given its location, but came away disappointed. The owner was friendly enough, but was telling the same tired stories to each table about cooking for Jackie Onassis 40 years ago.
Food was uneven--Moussaka itself was reasonably good but the sides were not. Was not impressed with the Baba, Hummus, or Tabbouli and did not find the pita to be edible. The owner was pushing his "famous" lemon potatoes which were, unsurprisingly, boiled potatoes with a squirt of lemon juice and a sprinkle of oregano and quite ordinary.
What saves Christos from being banished in the abyss of a two star rating is the prices--at $10-13 per entree in the cultural district. But you always get what pay for and Christos is no exception.
Personally I think Alihan's next door is much much better for Turkish/Greek food and only moderately more expensive.