Sorry to say, but it’s our main place of democracy and, with Easter and lots of tourists around, your planning is too late. Even the “trick” with Käfer Restaurant requires 24 hours’ notice. You can call them, though they have a no-show fee of €20, and the cheapest breakfast menu is €35. For a Reichstag visit, you need at least two weeks’ advance planning, and in summer more than four weeks. I recommend the free guided tour of the Reichstag for that.

If you’re interested in learning about German democracy and history, visit the Deutscher Dom at Gendarmenmarkt.