Important: ask for vegan stuff to be offert as a standard and not only upon request! Argument that many people are currently changing dietary patterns towards more plant based, and probably more people than the one asking for it will make use of the vegan options.
@bhaug I can conform that, was recently in Amsterdam in an ecological "vegan-friendly" hotel. I told them in advance that I'm vegan.
There was nothing labeled, I had to ask what was vegan - hummus, baba ganoush and grilled peppers. No vegan butter. No oats. Had to ask for plant-based milk. Then they said I should have told them in advance