This is a nice place to eat vegan/vegetarian sushi. But if You're vegan You'll have some difficulties because they have a lot of things with mayonnaise for example. For vegans there are better sushi places in Bonn (Makiman). The staff is very nice and friendly. The seats are very close together so You don't really have privacy there, especially not, if there are many people.
Cons: Miso with fish, too expencive, arrangement of the seats!