We planned an extended city trip of a week in Berlin with two small kids rather than the typical beach and pool holiday. Marie's apartment was perfect: perfectly located, clean, very spacious and with a very nice terrace giving you a wonderful view of Berlin. Our kids were very excited to be able to play with all the toys from Marie's three kids.
We met Marie as she was on her way to a vacation of her own and she was very welcoming. She left clear instructions about practical things and useful info on neighborhood restaurants. She also contacted us to see everything was ok when she heard a storm hit Berlin which was very nice.
So overall, we definitely recommend this Marie's apartment for a fantastic stay in Berlin.