Yiannis is located in Town and Country in a small shopping strip. The staff is extremely friendly, the food is reasonably priced, and the taste is excellent. Price ranges from $7-10.
My personal favorites are the greek salad (get it with the potato salad on the bottom for a more 'authentic' taste), the cheese bread appetizer, and their cheese pizza.
Since it is not well known, you can usually find a table during the weekend evening hours. Great for those times when you don't want to wait an hour at a chain!