We enjoyed this relatively new restaurant and will be back.
It's a little out of the way, but easily reached, either by underground train or using the excellent Rosengärtchen underground car park directly in front of the hospital and not 100 steps from the restaurant.
The restaurant is small but comfortable. I found the music a little loud and the lighting a bit too low, but neither was an issue. We arrived at 7pm on a chilly wintry Saturday and were glad we had reserved via the restaurant web site as all tables had been booked, most for 8pm.
The menu changes every couple of days and consists of about 10 dishes, but several dishes stay on the menu longer due to popularity. The dishes are all vegan. We had Flammkuchen, which were super-thin and crispy,with tomatoes, shallots and a very creamy-tasting smoked tofu sauce. Not a crumb remained, delicious. We also had cannelloni, which were good, if the savoy cabbage accompaniment was a little watery. Also on the menu were a lentil korma curry, that a work colleague rates highly, and a caramelised 'tatin' mango on pastry as a dessert.
Service was good, speedy and unintrusive.
For four of us, a bottle of wine and a couple of soft drinks we paid under 70 Euros, which is good value for Frankfurt.