After a long and tiring journey to Berlin from Singapore (where weather conditions meant delayed luggage, cancelled flights, etc), arriving at Stefan's place where it was clean, warm, and spacious restored a large part of our sanity.
It is also convenient (close to the train stations), beautiful, safe, quiet, easy to look for, and has useful amenities nearby (such as cafes with vegetarian options). Communication was good and was welcomed when we arrived. Would 100% recommend.