The best pierogi, quality and price both taken in for consideration, can be found at Pierogarnia na Bednarskiej. They have endless meat and vegetarian options and dessert pierogi that I thought could only be found in my dreams. The blueberry pierogi with the cream sauce (not sugary) are absolutely fantastic. And this place isn't a restaurant, more like an upscale milk bar so prices are pretty good too. If you go, go early. They usually run out of pierogi by the early evening.