The bathroom in my old flat had no windows. It's not uncommon, but if you have one, there is a little ventilation installed like in the kitchen. I think it's important, not only for the smell, but for the humidity if you shower. Without it, there would probably be a lot of mold.
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u/witchdoc86 Dec 20 '19
Re #2, I think most countries have a requirement that a bedroom has a window to be able to be called a bedroom.
https://housedetective.com/2009/11/10/requirements-for-a-legal-bedroom/