The startup/tech "scene" in Berlin seems a bit immature compared to London. There seem to be a few companies doing interesting things, however the scale doesn't seem to be anywhere near London at the moment, which has a good mix of startups and established companies and massive amounts of capital flowing through the city. Berlin is great city though, and looks like things might take off in a few years!
it sounds like an interesting space apart from the tech. the artistic city and culture has a lot of buzz, but I've only heard this second hand because I've never visited.