I had read about this place on happycow and decided to stop in on my way from San Francisco to Los Angeles several weeks ago. Here's my Kreuzberg review.
It's definitely more of a coffee house than a restaurant, though on the wall outside, you can see a food menu displayed. I read it and saw lots of chicken and meat and was hesitant to go it... but then I found a few vegan items.
The coffee of the day was from Ethiopia, and I decided to get it. Comes in pour over, single drip, or french press. I got the pour over and it cost $3.75, and unfortunately it was neither hot nor tasty. Sigh.
The interior has a bit of a grunge feel. The other customers I saw were young people, a few hipsters.