I missed the point about the toilet being down the corridor from the bedroom, which is my fault for not reading "Additional rules" properly. Not great having to find your keycard and make yourself presentable at the middle of the night in case you encounter other hotel guests but I guess that's why the room is advertised on Airbnb rather than through the normal hotel website. But well worth it compared to Zürich hotel prices generally in what felt like the best part of town to stay in.
I think I encountered 4 members of hotel staff and they were all really friendly, helpful & professional. Would recommend the hotel based on that experience alone.