I'm partial to Sichuanese food and I like South Beauty in the Oriental Plaza, ground floor, east end. I think they have some of the best Gong Bao Ji Ding anywhere. Not many foreigners though a bi-lingual menu. Setting and decor are pleasant.

I also like: Chuan Ban Canting 川办餐厅 at the Sichuan provincial HQ in BJS,
5 Gongyuan toutiao Jianguomennei Dajie 建国门内贡院头条5号
It's Sichuanese and it will have a more low-key feel and I didn't see any other foreigners on my visit in May.