Been to Magma on a couple of occasions and with different people and everyone has a different take on the place. Personally, I find this authentic place homely with it's slightly run down feel and place cooking. No flairs, no bells and whistles, just plain cooking. It's just like what you'd expect to be served if you visited a friend's home in Germany.
My favorites to order are the flamkucchen and the pork knuckles. They do have a good selection of beers and wines and the proprietors are very knowledgable with their products so feel free to ask for recommendations.
The service can be very different at times, I'm not sure if the staff turnover is high but they staff just seem pretty lost at times or simply clueless.
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