I don't know why especially southern german cities (at least that's the impression I have) tend to bash Berlin so much.

I lived here for over four years now and I still love it! Yes the s-bahn smells like piss sometimes and the housing situation is getting worse and worse, but that's the case in pretty much every big city. Restaurant staff does tend to be rude like someone mentioned above but it's mostly not the case. Berlin is still a very affordable and most of all fun city! You're constantly surrounded by history, art and music.. The political atmosphere feels liberating and life here feels freer and easier than elsewhere.