Pivovarská restaurace Sladovna     

Vodičkova 12/5, Prague 120 00

Acts as a tap room for Pivovar Cvikov

U Fleků    

Křemencova 1651/11, Prague 110 00

Classic Prague beerhall now a bit of a tourist trap. Beware if they offer you a schnapps when you sit down -- it is not free (quite expensive, actually).