Our night in Ljubljana reminded me that it really is the best capital city in the world! We left the theatre and following Ivana's suggestion, we walked maybe 200m to Dabuda (which I discovered has a website here). It was a great place - funky decoration, beautiful people, fantastic cocktails, with a buzzing atmosphere but not stupidly busy and not ridiculously expensive! Perfect.
Certainly I can't imagine anywhere in Cambridge that cool, and anywhere in London would require a second mortgage (it cost 38Euro for 8 cocktails). The thing about Ljubljana is that if we had walked another 200m we'd have found another similarly great place.
Maybe I can persuade MSR to set up MSR-L :-)