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. 

Located in a vintage ballroom, Clärchens Ballhaus is a nice lunch destination. Try the "Käsespätzle" with applesauce!

Tuesday's lunch hour tip is the amazing Berlin Philarmonic. A short-duration concert (around an hour) happens every Tuesday at 13h, for free. People make the Philarmonie's foyer full, sitting on the stairs, on the ground and everywhere around. Little advice: bring with you a little cushion for more comfort and try to arrive early to find the good spots.

Secret place that is almost always empty.

This chapel at Dorotheenstädtischer cemetery hosts a light installation by THE James Turrell at sunset on specific days. It begins with a 30minute intro and needs a booking to visit.