I showed up to the front door, and I typed in the access code 3 times without success. This code was received by email. Then, I tried the intercom button. The front door opened.
Using the check-in kiosk, I entered the reservation number with other information asked. I could confirm that the system recognized me because of the information it showed on screen. At the end of the process, I got the red box message that my reservation information was not available at that moment and to try later. Same result after 3 times.
I hooked up the phone twice on the kiosk without anybody answering.
After a while, a kind customer helped me with this situation. She called the office 3 times with her phone before she got someone answering on the phone.
I finally got a code to enter the building and a code to enter the apartment. The code for the building was completely different from the code I got by email. This means I got wrong information by email.
That is what made the check-in experience the worst.
The next day, I hooked up the kiosk phone to see if it's supposed to work. Someone answered.