Daga Brewpub (Fuxing Lu)
This place has like 40 Chinese beers on tap (some are great, some are works in progress), and the third floor here is one of the nicest rooftops in the city, perched high up in the canopy. They have domestic beers like Master Gao and NBeer on draft, and you can sample as many as you like until you settle on something good. Some flavors, like the "Zhong Nan Hai Stout", get pretty eccentric (read: questionable). The service is friendly, and while they have food, it's hit and miss. Avoid the hummus. Their daily happy hour involves 35rmb-45rmb drafts for a selection of 8-12 beers.
Daga Brewpub (Fuxing Lu)
100 Fuxing Xi Lu, near Yongfu Lu