Found the culprit which is directly under the bed sheet.
Spoke with the duty manager who was rude, arguementive and defensive.
I will not stay at this hotel again!

QUOTE=nicolas75;36221213]I'm not sure I understand why pillows are so awful in Berlin (especially as you have a pillow menu on request).
As for duvets, this is the case in most hotels in Germany (and it's very comfortable).[/QUOTE]