You can have a quick bite or a proper meal. All vegan and not expensive by local standards. You can have a snack for as little as 6 or 7 PLN and a soup for 10 PLN. Close to Metro Politechnika.
It’s not fancy, it’s not instagramable but it’s delicious and you will be served fast. Great value for the money and right next to the metro if you’re on the go!