I went here several times when I stayed in Krakow and was quite pleased with the range of choices they had. The only thing I missed was chocolate (there was one type of non-vegan chocolate bar). They had different sorts of (vegan) biscuits, tofu, spreads...
The staff was very friendly and helpful even though they didn't speak much English.
I also liked the fact that all the fruit and veggies were from local farmers.
The shop was always crammed with people.