The room had no space to hang your coat and only 1 chair (not suitable to put clothes on).
There were only 2 coat hangers in the closet. When wanting to call the reception to ask for more coat hangers, the phone wasn't working.
When I went down to ask for more, they didn't have any standard ones but they did give me a few, which was better than nothing.
After coming back in the evening after visiting Berlin, we found that housekeeping had left the window open from 2pm till 10pm, in 6°C weather in January. It was freezing cold.
Another complaint of me personally but apparently that's typical for Germany is that there were 2 blankets instead of 1 big one. My partner and I did not like this at all.