I left Berlin about 10 years ago and since then the city has changed A LOT. Unfortunately not always to the better. My beloved hometown has undergone a massive clean up and upmarket-conversion. Hence many old and interesting buildings then often still showing the scars and bullet holes from the second world war have now been sanitised or knocked down.
For me that is in many cases a big loss - as those imperfections made it so different from all those polished cities in the rest of Germany and so inspiring for artists and art lovers from around the world.
But not all is lost and of course there are still many fascinating things to discover. Although I am a bit scared that in another 10 years time this will be much, much harder to do.