It is a bit of a treck to this place, however if you get off the train at wuhlheide you can take a really nice 20 min walk through the park past FEZ (or you can drive or take a tram from somewhere which stops right out front).
I got the very expressive special schnitzel with vegan hollandaise and white asparagus! So great but 18euro as it was massive and was a special.
My friends got the celery schnitzel at around 10 euro and the the goulash at around 10 euro too. Both were amazing!
The ambience could be improved, some music wouldn't hurt but I would defiantly come back, I imagine it would be amazing in the summertime with the big doors open.
Cons: off the beaten track