As to the recommendation of Jojo/Vegan In Brighton, I went to Nova Krova in Krakow whilst I was visiting and it did not disappoint.
I had the seitan burger
The texture was incredible. I ended up having to eat it with a knife and fork as I am weak when it comes to holding burgers together.
For pudding, I had a chocolate and raspberry cake.
Very light and fruity and the icing wasn't too sweet.
This place is definitely recommended if you ever go to Krakow, it's in a really interesting area (the Jewish district).