We went here twice during our stay in Prague. The food was pretty good. We had duck with some side dishes the first time and one of their hotpots on the second visits. We tried several Chinese restaurants in Prague, and this was one of the best we experienced in the city. However, that is starting at a relatively low bar for this type of food.
All of the staff members are Chinese, and I think they really tried to do their best; however I could see many patrons getting irritated at times by their slow service. The place gets packed with tourist groups from Korea and China. When they come it, it gets a little crazy because of the large number of people ordering at the same time.
The location is conveniently located in Náměstí Republiky.
Bottom line: We would visit the place again if we were to return to Prague. Note that the servers do not speak a lot of English, but they will do their best to serve you -- when they get around to seeing you. ;-)