To escape the tourist hordes on Unter den Linden, duck into the side of Humboldt University for some quiet time with students and professors. Classical music plays, the room is elegant with light lemon-coloured walls and you'll feel like a part of Berlin, even if you, as a Gast, will pay a little more for your dish than the Studenten. The kitchen doesn't get good scores, so stick to soups, the tap beer or coffee and house-made cake.