My friend and I learned about this place during a free walking tour of Krakow. We went twice, and my friend even took some pierogi to go so she could share them with her family in Budapest. The place does constant business because the pierogi are so good and inexpensive and the people are friendly. It's a tiny place, maybe five people can sit inside (but even that would be cramped) and there are a couple tables outside. In addition to savory pierogi (such as potato and bacon or spinach and cheese), they also have sweet ones (at the time we were there, strawberry or blueberry). If you're in Krakow, you must eat here!