Wow I've only stayed in about 100 but have seen several. There are several variations:

- bathrooms with glass walls but with (glass) door

- bathrooms with walls but without door

- bathrooms with partially open walls, sometimes even with door :P

The worst was when I was once sharing a room with my daughter and the bathroom was one with glass walls and no shower curtain. We decided to schedule our toilet visits and showers so the other one would not be in the room.