An American-style pizza restaurant with beer on tap.
They serve the best pizza in Beijing and it's perfect for when you get tired of gloopy soup and fatty Chinese pork. If you're only in town for a short stay you should, of course, try local dishes (especially duck) but after a few days you'll probably want to try Kro's Nest.
It's not easy to find though. Apparently there are a couple of branches but I've only been to the one at Workers' Stadium.
I read about it in Beijing for Beginners: An Irishman in the People's Republic and it has been a life-saver since.
Take the subway to Dongsishitao and walk east. When you get to Workers Stadium, walk inside the gates to the car park. The restaurant is on the left but the entrance is around the corner down a gravelly walkway. Not a very attractive entrance but inside makes up for it.
www.thekrosnest.com/
Is this your business?
Have been to Kro's Nest once, thought it was pretty good, but better if you are in a group because it generally does large pizzas.
I'm not such a fan of communal pizza eating, and much prefer the gourmet pizza straight from the stone oven at the Tree in Sanlitun back street, accompanied by one of their (fairly pricey) Belgian beers.
Elisa's on Lucky Street have a proper stone-baking oven, good prices and free delivery to most places on the Eastside. Have not eaten there though.
Both these places can probably be found on www.cityweekend.com.cn/beijing/ which should give you a map too. If not, try thebeijinger.com or timeout listings.