I have been there once only as I don't come to this area a lot but would certainly go to Attis Cafe again.
I didn't go there on a Thursday but they still had some vegan things to choose from. There was vegan pizza and vegan hot dog out of which I chose the latter as I wasn't too hungry. The hot dog was nothing special (I don't suppose hot dogs are designed to be anything special) but good for a quick snack. I also ordered a Bionade and a piece of tasty vegan carrot cake. Together, those three items cost just around 5€ and where thus absolutely well-priced.
The owner was very friendly, too.
I hope Attis Cafe will turn all veg* soon.
Cons: Not 100% veg* yet