If you don't wanna spend much money Bratislava is the city for you! Bratislava is among one of the cities that are good to visit when you are on a tight budget. Not only the prices of the beer but also accomodation is quite cheap! Check this article and blog.
More information about prices in Slovakia you can find here.
WorkSpace Europe is the first and currently only national Erasmus consortium of universities in Slovakia, accredited by European Commission.