The bathroom is the US term but we don't put toilets in a separate room so it's ok.

I know it’s the US term, Mrrzy, but during my many working visits to Houston TX, I’ve heard guys refer to ‘the bathroom’ when they were talking about toilets in shops, offices, bars, restaurants, even public conveniences! None of those that I went in contained a bath, or even a shower!, and when a guy I’m drinking with in a bar asks the bartender “Where’s the bathroom?”, I really don’t imagine he’s going for a long soak!

For that matter, when he asks where he can find ‘the rest-room’, I’m pretty. Certain he’s not going for a lie down and a nap!

See what I mean?