There are many crayfish restaurants in Beijing. Here are some shops with good reputations:

1. Ma Xiaochuan: Located at No. 2 Nanshatan Road, Chaoyang District, Beijing, it is a small crayfish restaurant. A lobster-focused restaurant. Their crayfish is delicious and rich in flavor, making it a favorite among customers.

2. Lido Hotel Restaurant: Located in the Lido Hotel, No. 6 Jiangtai Road, Chaoyang District, Beijing, it is a restaurant focusing on crayfish. Their crayfish is also popular, with a delicate texture and delicious flavor.

3. Donglaishun Restaurant: Located in the north of Jishuitan Bridge in Xicheng District, Beijing, it is a restaurant that mainly specializes in Beijing cuisine. Their crayfish is a specialty, delicious and rich in flavour.

4. Yaoji Braised Chicken Restaurant: Located at No. 14, Nanlishi Road, Xicheng District, Beijing, it is a restaurant focusing on Cantonese cuisine. Their crayfish is also popular, with a delicate texture and delicious flavor.

The above are some crayfish restaurants with good reputations in Beijing. You can choose according to your own taste and preferences.