The Irish Rover, which is halfway up Strøget, owned by my mate Jono. Then there's Mick Foleys, on Vesterbro (Stenosgade 1), which has music at the weekends, and an excellent session on Sunday nights (hosted by Dessie Higgins) and Kennedy's (just round the corner from Foley's).
There are other places, of course. But those are about the best venues in Køben.
Might even see you there....