Omas Küche is a decent restaurant -- one I certainly wouldn't mind visiting again, but not one to which I would feel especially obliged to return. The food is good, standard, hearty Badisch/German fare prepared competently and served in a traditional Badisch environment. It's not the best German food you'll find in Freiburg but if you like this type of food, it won't disappoint. The service is fine as well.
However, I find there are two main problems with the restaurant -- first, the prices are simply a little too high for the food that you get. These aren't ridiculously high prices, but for the food you get, I would have expected to pay less. Second, the only beer served is Ganter, which I always consider a serious downside to any Freiburg establishment. At a German restaurant, it's a big problem as I, for example, especially like to drink beer with many common Badisch dishes, like Leberle, for example. And Ganter is horrible beer.
So I would not suggest seeking this place out, but if you're nearby and hungry, it's not a bad place to visit.
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