It is in the extreme southwest of Germany, just north of Basel, Switzerland. The mentality is very different from Berlin.
Berlin is tough and vital and gutsy, a worker's city, and a cosmopolitan city par excellence.
Freiburg on the other hand, is provincial and relaxed and charming, relying on its famous university for its claim to world-wide importance and sophistication. A streetside puppet show You take a long lunch, walk the streets, shop in boutiques, sit in a cafe. If you travel, it is to Milan or Paris. Berlin is at the other end of the universe as far as Freiburger's are concerned. They couldn't care less, and aren't straining to worry about the integration of the two Germanies.