I tried it last week twice but definitely it was not one of my best experiences. Their menu is mainly cheese and egg-based, so there are not so many options for vegans. And the ones available lack inventive (but are certainly healthy): grains, beans, lentils, and some smoked tofu. I tried it twice, and the only positive aspect is that you can have hearty food in a city where it's not always obvious to find vegan food.
Their fresh squeezed vegetable and fruit juices are nice though, and you can also make your own dish by selecting the ingredients you prefer. No vegan desserts, except for a simple fruit compote.
Cons: not many vegan options, no vegan desserts