Compared to any other city in Germany, France, Italy, and The UK not even to mention Asia Poland ranks at the very bottom of the street food chain. I know because I live in Krakow, Poland The street food here, what little there is of it really sucks.
Maybe best street food, but probably not the best food overall. It seems like Warsaw street food is a pretentious hipster shitshow. Mimicry of LA hipsters. I rather stick to my everyday chow.