Polskie Smaki is quite a cheap place serving the Polish food. Despite being bar mleczny-like, their food is great. It's also self-service, so no much to tell about it
I usually order zurek...
...and pierogi, which are their local speciality (14zl). There are usually at least 3 types of very tasty pierogi, mostly with meat filling.
They are also the winners of the annual Krakow pierogi festival
Central location, good food, higly recommended
Polskie Smaki
ul. Sw. Tomasza 5