The check in and out were easy as it is descriped. The place was well designed, clean, peaceful, calm, spacious and has everything what you need for a shorter or even a longer stay in Berlin. The neighborhood is clean, pretty, green as well, there's a shop on the next corner which is opened almost every day. It is a little bit away from the mitte / center /, used the U- bahn (u2), it took 25-30 minutes which is 3-4 minutes walk from the apartmant.
we would recommend this for everyone who wants to relax after his/her big walks around Berlin :)