One day during our stay a women came into our room without ringing the bell or even knocking. She said sorry and left really quickly so I couldn't even ask her if she was a cleaner or not. That was uncomfortable. Especially cause the shower is see through from the entrance..
The room was clean and equipped well. It is close to the station and Christmas market and a few stores close by.
I didn't feel that the self check in system was convenient. It is a bit of hustle before hand.