Constantin's room is superbly located, easy to find, and situated next door to many of Berlin's most pulsating locations. His hospitality was second-to-none and not once did I feel unwelcome during my ten day stay. I wouldn't hesitate to recommend this room to anyone looking for an economical, unique and convenient stay in Berlin, as Constantin's room will undoubtedly be at the top of my list when I return to the city in the future.