does anyone here work in berlin or know people working in berlin in the design field?

or also know off hand what firms are based there?

if you are into industrial or product design, the choice is very limited, since there´s not much industry around Berlin. Try one of these:

Berlin has way better choices in graphic design, there are lots of advertising, media and graphic design agencies in all budget ranges like:

there are many more, lots of freelancers and small 1-5 people agencies, but i´m not into graphic design, so maybe someone else can help you out…