I had the vegan pizza a few times so far. One year ago I was not that satisfied but they improved a lot! Now you can get a vegan pizza including some vegan cheese alternative (melted) made of yeast. Usually the topping is fixed but you can change them nevertheless. We also used the delivery service a few times and were always very satisfied.
The pizza bread with garlic is also vegan and worth it to try unless you still want to kiss somebody that day :D
The prices are adequate and students even get discount.