I visited Berlin in December with my cousin and stayed at Karin's place. Unfortunately, she was out of town, but we were very warmly greeted by her housemate, Norbert. We received sterling treatment from Norbert. He was constantly in touch even before we arrived to ensure that we found our way to the flat easily. Once we arrived, he was the most gracious and attentive host. He helped us plan our activities by giving excellent advice on what to do in Berlin according to our taste. The flat itself is in an interesting and diverse neighborhood. It is well located close to the U-Bahn and bus stations. Getting around the city was easy-peasy. I would definitely recommend it. And I would stay there again.