This evening, I called the lady again and spoke to her husband. He said that in the meantime he had looked in the map and the address looked unfamiliar to him as well; he had been there before but it wasn't in the street he had told me.
He promised to find out and call me back; ten minutes later, he said that the road was called Moorwinkel, not Moorlage—and that makes more sense to me, since it's in an area where I know the Jehovah's Witnesses have a chapel. Apparently, he had been informed wrongly and the gentleman who had given him the address apologised profusely for the mistake.
Well, good thing I called. I wonder what it'll be like at the Memorial.