I used to go here regularly when I lived in Bremen. It's a little place, in kind of punk-diner style, run by nice people. They serve burgers, hot-dogs and falafel, all home made, very high-quality and very tasty. But if you go hoping grab a quick, inexpensive burger, you might be unpleasantly surprised. A burger or falafel, with a side and drink will cost you between 7 and 9 EUR, and the burgers are tiny (although, like i said, delicious).
The thing to do here, in my opinion, is to go in, sit down, and make a proper meal of it, and try a few different things. The Tricolor Falafel plate is great, it's 3 kinds of falafel with salads, sauces and garlic bread for about 7 EUR. There is also a special which changes every day, for about 9 EUR, these are hit and miss, but I've had a few great ones. They have a few deserts too, although i've never tried one.
Overall, it's a good place, and worth a visit for any vegan visiting Bremen.Pros: Good Food, Nice Staff, Nice Atmosphere
Cons: Small Portions, Limited Healthy Options, A Little Pricy