I frequently eat there, it is by far the best vegetarian Restaurant I know in the large Frankfurt area. Very good taste, typical german and international dishes, both on vegetable style as well as fake meat dishes.
Food and drinks are mostly or 100% organic, no NSG used.
Most dishes available as vegan, some are vegan anyway.
English is spoken.
They have a monthly menue with related to the years time. Bring some apetite with you to have this!
The people there are very nice, relaxed and helpful.
My personal recommendation: The Carrot Ingwer cream soup, the Hungarian Seitan Gulasch, Marzipan sushi and one or two of the organic beers from Rother. Yummy!
Cons: Too far from my home...