A place where I spend some time almost everyday is the Marheineke Markthalle on Bergmannstraße in Kreuzberg. It's just around the corner from where I live and a great place to buy fresh food and products from local farmers or all kinds of delicatessen from different countries. Many market stalls also sell freshly prepared food and it's always busy at lunchtime. For saturday mornings try the original french croissants.
KINDL- Center for Contemporary Art. It’s an old brewery that has been transformed into an Art Center, … both galleries often have unusual, beautiful and thought provoking shows.
Peres Projects mostly showcases young, emerging artists and is at the forefront of fusing art with fashion, celebrity and the love of a good party, which seems to work very well in Berlin. Having recently moved into an ex-Soviet building on Karl Marx Allee, the giant new space contrasts brilliantly with the commanding facade.