The underground wine cellar theme is done very well. It's a comfortable place to sit and relax.
They have live music but there is nowhere to dance. Kazimierz is definitely a sit down and sip your wine kind of place.
Everything is over priced so don't be surprised when you pay $8 for a glass of their cheapest wine. They use large glasses but don't put much wine in them -- but at least it looks like you are getting a lot.