The check-in was problematic, I arrived there at right time and when I got in the place was mess, used bed sheets, bathroom and kitchen were dirty, and the smell was unbearable. At least when I messaged the host, he was quick to solve the problem, but I had to stay out of the place for a few hours before the cleaning was done. Köpenick is a nice and calm place and relatively easy to get to Berlin's center from there. I'd say the best parts of this place are the little park beside the river and the supermarket a few steps from it.