Perfect host, perfect location, perfect apartment. We arrived early but Heidi was happy to keep our bags so we could explore a bit before we were able to check-in. The apartment is exactly as listed, and has everything you could need/want. I didn't expect the iron & ironing board, so that was a nice surprise. The U-Bahn stop is just steps around the corner, but even to Potsdamer Platz it's only a short 10 minute walk. We stayed here for 4 days while I ran the Berlin Marathon. If you're looking for something that's in a central location but away from the hustle & bustle of the center of town then stay here. Windows are nearly sound proof, the courtyard provides privacy, peace & quiet. I'd choose Heidi's place again in a heartbeat.