Besides being the friendliest shoemaker in town, he also offers quality for good value. 

The Hamburger Bahnhof – 'Museum für Gegenwart' which was originally a train station is a terrific museum featuring a selection of contemporary art.

Zola is a Neapolitan style pizza joint hidden inside a Kreuzberg backyard. This is a killer pizza place, one of the best in Berlin without a doubt. 

It's an old entertainment park. It's closed now, but you can sneek in and see how nature has eaten the place up. Really nice to take pictures.

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.