I now insist on two bathrooms, got used to it on our old house.
But before we did it up, the bathroom was downstairs - and it had a kitchen sink (yes, the stainless steel type

) and a bath. The one and only loo was half way upstairs, literally on a stilt
The previous owner was a plumber and instead of making everyone use the outside loo, he'd built this on the dog-leg of the staircase. Took us ages to actually knock it down.