so tylee78: where did you get the information that everybody is leaving berlin? what kind of people you are talking about? it seems you haven't read the article. berlin is booming. every week two new startups are launching. berlin has two airports from where you can get to every other destination on this planet. berlin has several good universities and huge amount of young talented people. even academics from the best universities in germany (whu, ebs, hhl, mannheim etc.) and even from the U.S. (e.g. Research Gate - forunder moved from harvard to berlin) are moving to this city, because it is a perfect environment to create a new company on a low level of costs.
berlin isn't more dirty than hamburg or munich. berlin is just a huge city, where some parts are of course dirty, but it is the same for munich, hamburg, new york and san francisco too. berlin is the place to be in europe, if you want to setup a tech startup. if you care more about other things, you really shouldn't start a tech startup.