Downstairs is the pay 12 quid buffet where the Chinks sell sub-standard greasy sugary crap for Brits who think they're being all cultured and experiencing Chinese Cuisine,
Upstairs is where you will find all the Chinese Students and others eat proper food.
You can get a really nice Szechuan hotpot for £20 per person.
My fav chinese dishes are Mapo Tofu and Dandan Noodles