You can find the key in the key box behind the mailboxes.
You will receive the PIN code by email one day before arrival. Enter this on the keyboard and then move the oval closer on which "Masunt" is written to the right.
In the key box you will find two keys. Please only use the left one with the "thick" tag. The other key is only intended as a replacement! Please don't forget to close the box again and put the oval closer vertically.
The top key (with the round head) is for the front door and the bottom key (with the square head) for the apartment door. The key for the front door sometimes gets a little stuck. Pull the key out a little and try again.