I loved staying with Michael and Chris, his roommate. I stayed there for 1,5 month and it was a nice and safe place to come home to every day. Michael is amazing: always makes sure you are well and puts erergy into introducing you to the neighbourhood and his friends! Even though the place where you sleep is small (yes, its a bunkbed in a corridor) there is plenty of space to put and organize your stuff and you can work/chill in kitchen. Would definitely come to stay here again when in Berlin!