Well, Berlin has a couple of big schools. I don't know how friendly they are to foreign students who wan to come over for a semester. There are so many student enquiries already! Does your school in Denmark have a partnership with any schools in Berlin already? That could help a lot.

Anyway, here are the schools that I can think of off the top of my head that teach graphic design in Berlin. These are all state-run institutions:

Universität der Künste Berlin
Kunsthocschule Weißensee
HTW Berlin

Then just across the city border is the Fachhochschule Potsdam.

Thank you so much.

I know my school ( the Danish School of Design) has some partnerships, but not sure yet which ones. I'll have to ind out.
I'm pretty sure Berlin could be great, so if the schools won't have me, I'm gonna try find some place to intern. :)