The Schwartz family flies to Marrakech on Saturday — wife, husband, two kids aged nine and twelve, ten days of Atlas trips. They need €2,000 in dirham. Friday afternoon Mr Schwartz opens the map, compares four verified exchange offices in Kreuzberg on live rates. Omar, family business since 1998 at Skalitzer Straße 80, 10997 Berlin-Kreuzberg, 4.7★, offers 0.9 % over interbank — the airport counter sits at 4.2 %.
Omar confirms in eleven minutes, locks the rate for two hours. Schwartz drives over, brings IDs, Omar counts twice, prints a receipt. The kids eat baklava at the café across the street while the father verifies the bills.
Difference from the airport: €88 on €2,000. On arrival in Marrakech the €88 covers a tagine dinner overlooking the medina. Three days later the older son still talks about "the man with glasses in Berlin who gave us the meal".