This film is the opening film of the BUTFF
Rammbock
Just when Michael arrives in Berlin to visit his girlfriend Gaby, a terrible virus spreads accross the city, turning people into zombies. Much to Michael's concern he cannot find Gaby, but ends up with a apprentice plumber at work in their appartment block. Together they manage to barricade and hide from the mindless, homicidal maniacs.
This humoristic German Zombie flic was made for television (!) and proves that zombies can better be out-smarted with clever tactics then repetedly shot in the head.