We have tried different places in Beijing for hummus but by far Biteapitta is the place to be! We completely agree with other reviews that it's really too bad about the location (Sanlitun Bar Street) and the interior (lack of decoration and too well-lit). It's definitelty not a place for a romantic evening...
Having said that, it's more than worth a visit for its food. Not just the hummus, but also the labaneh is superb. The pita is freshly baked and doesn't have the sweet taste that we dislike about the other pita we've tried in Beijing. We haven't tried the meat yet (- every time we decide to order more pita and hummus...) so we can't say much about that.
One last note: the staff is friendly and helpful. Some even speak a little Hebrew - and of not, the owners are usually around for questions and advice!