As the heart of the university district of Beijing with so many foreign students the restaurants tend to cater to a very international crowd. There are also some good Chinese options. Here are a few:
Sushi Jiuliu (苏轼酒楼):
This Suzhou Restaurant is on Chengfulu (northern side) between Lotus and the KFC on the second floor (map). The entrance is just behind the bus station. Try the Dandanmian (担担面), which are not on the menu!