What Americans think about German bathrooms:
In most bigger German apartments or houses, bathrooms have windows. So no need for a fan as Germans love to open windows anyways. We even have a special word for it, as we also think it is absolutely necessary for preventing mold in the house. So "lüften" (opening windows even if it is freezing cold out) is a part of our daily routine anyways. After every shower or a longer appointment with the toilet, we open the window (windows are even able to open in several different angles and usually we open the window only on the top, which is called "kippen"). My husband thinks that is all completely nuts and backwards, having to freeze his butt off while he goes to the toilet as somebody was in there right before him and opened the window...
What Germans think about American bathrooms:
I still think shower curtains are from the 90s or for student's apartments. But I have to give you credit for the genius idea of having actually two curtains - one for the inside to make sure the water doesn't splash outside and one for the outside to make it look (kind of) pretty. In Germany it is one layer of curtain and you can decide if you like a water puddle in front of your shower or have it tucked inside the bathtub, but have an odd look from the outside.
Big fluffy, nice smelling towels treated with fabric softener and dried with nice smelling dryer sheets? We think the water pearls right off the towel, it is basically useless as a device that should make you dry and my mum is convinced that too much fabric softener added to my sister's neurodermatitis when she was young. So I grew up on slightly stiff, scratchy towels either sun dried in the summer or hung up in the basement for about 4 days waiting on the laundry to get dry. And that's just the way I like it;)