Praga is the alternative district of Warsaw. Several years ago this place had a very bad reputation being the home for small-time criminals, but later artists and hedonists conquered the district, and made it to a very unique place of Warsaw.
Praga was also the district where most of the buildings were not completely destroyed during the second world war.
If you want to see the typical character of the old Praga, you should go and visit the Zabowska and the Brzeska street. Redecorated storefronts with pubs and restaurants in bakestone characterize this passage.