We were a group of six colleagues attending a math conference at the Freie Universität. Hannes' place was exacly what we were looking for: spacious and comfortable rooms with much light, very suitable for discussions and for relaxing after a long day. The location is great; the university, public transportation, and grocery stores are in walking distance. Hannes is a very friendly and responsive host! We had a great time in Dahlem! Highly recommended!