On a leafy street in Kreuzberg is Kuratiert, a contemporary illustration gallery and shop selling prints, ceramics, textiles and more by some of the best creators from Berlin and the world. It also hosts regular dedicated exhibitions, and is a great place to browse for gifts, or just inspiration.
The best cheeseburger in Berlin costs less than 5. Burgermeister is mandatory in town when you're craving for a basic and delicious to the bits chesseburger.
A very nice little second-hand bookstore, including a shelve with international books in French, English, and Spanish too. Always nice people to meet and a great selection of art and cook books, for affordable prices.
Rixdorf is definitely my favourite area of Berlin, because it is a historic village within in Berlin. At the moment it is under heavy construction, and I found this strange, nearly taken-down building sitting in the middle of the quaint neighbourhood.