This is a self-service snack-bar which claims to be health-oriented. However, it is not vegetarian and we didn't experience it as being vegan-friendly. When my partner enquired (he is native speaker of French) whether they had anything vegan at all, the plain and unfriendly answer was: "non!".
Nevertheless we found a bulgur salad that was vegan, but unfortunately not very tasty. Two small salads in a plastic box and two small lemonades cost us 18,6€ - not particularly inexpensive in my oppinion.
Apparently at least all the soups are vegetarian. So as a vegetarian you will most likely be able to find something to eat. But as a vegan you're met with poor choice and ignorance. I just don't recommend it for vegans!
Cons: not vegan-friendly