It was quite hard to find bcs the place map wasn't clear for the person been in a China only for 2 days. Well it appears that the restaurant just few steps directly from the subway line #2 (blue) Chongwenmen station. You just need to get from the station and make few steps until you reach the huge road. The restaurant just on the other side. If you lost - ask anyone, the restaurant is really well-known.
Well it's a bit expensive (average price about 40 RMB). The stuff don't know English well, but very kind. Dishes were nice, big portions, tasty. I recommend this place but only if you have about 130 RMB for an average meal for 1 person.