Poland
In the old city and Kazimierz you will find many pubs and clubs, where you can spend the whole night (there is not any time limits for parties ;). Get your friends and forget about your problems - you will spend the best time of your life in those cheap, very often free places.
The old city in the city center and district called Kazimierz (on the south of the old city).
Charming. The whole city life is going on there. Watch the pigeons, hear the voices of everyday life on the market, drink a coffee at on of many cafes, chat with your friends - enjoy your life!
The main point of the city - near to the railway station, bus staion etc.