Super cool apparment, I came with my family and we felt like home.
The check in and out was super easy. Marcel was very kind and answered all our questions quickly.
It is near a supermarket and Lichtenberg station which makes it easy for getting in the city center. It is also very convinient if you want to visit Sachenhausen because there's a train that stops at Lichtenberg and leaves you in Oranienburg in 20 minutes.
Overall a good experience and I would come back to his apparment for sure!