Ok, it is not exactly Czech food, but the food is delicious, Lot of locals go there because its not exactly in the center but the food is great! Some of the best asian in Prague, I would have to say. Try the Udun Kachna!
If you are looking for a place with great customer service, and great food, then I recommend YamYam. Czechs in general dont usually have the asian food with many cheap restaurants around but YamYam is a really good one. I order from there online constantly.
Su-Sa: 11:00-23:00