Wonderful and large roof deck overlooking the roofs of Berlin. Clean and comfortable rooms. Two full bathrooms, so no waiting. Full kitchen (which we didn't use.) Most of our group had fun using the spiral staircase, although one of us found it hard to climb.
It is super close to a subway (U6) which easily connects to many other lines including the regional trains, but is not a straight shot to the usual tourist hangouts. The apartment is in a safe looking family oriented neighborhood, but again, is not a touristy spot (maybe that is a good thing.) Their are many Turkish restaurants in the local area.