This place has an amazing atmosphere from the minute you come in. The staff is helpful and knows what "vegan" means.
You should select a large plate with 5 or 6 different small portions of foods that you can share: lentil-based, mushoom, spinash, etc. they are all very well balanced, lots of flavour! You are served these foods with unsweetened crepes that you use with your hand (sink to wash your hands is available, spoon too).
The menu has a few vegan items, it's very delicious but costly. Probably about 30€ / person with a drink. I would recommend it if you have the money... ;)
Cons: Price, Can be crowded, Portions could be a little bigger