The Berlin Philharmonie's lovely lunchtime concert series has started again: every Tuesday at 13:00, they present a chamber concert, absolutely free of charge. Light lunch choices (unfortunately not free, but tasty and affordable), make it the perfect midday break at Potsdamer Platz, and a great way to enjoy some classical music without breaking the bank. Although you probably won't catch Simon Rattle there, the musicians are still top notch, and it's a treat worth catching.