Our stay at Karsten's place was everything we could have hoped for. The room itself was clean and warm and very nicely curated. The location was really close to a U Bahn station which meant it was easy to get around Berlin and is a short walk away from lots of tourist attractions (such as the Wall Memorial). Karsten took the time to recommend plenty of places to visit which was really helpful, he even pointed out a few vegan restaurants on the map for us. Great place to stay, thank you!