Just to define the word bathroom, you notice that Holly said the word "Loo." The loo is what we Brits refer to as the lavatory, others refer to the lavatory as the bathroom. In Brit-speak a bathroom would have a full body wash facility like a bath tub or shower. When the toilet is no more than a cubical with hand basin and lavatory, that's what we call a loo, others say half bathroom.
We have a five bedroomed house, two of the bedrooms have en-suit bathrooms, there's a master bathroom and two further loos or half bathrooms. There are just the two of us and not having any children we don't have grandchildren so her ladyship has one en-suit, guests have the other and I get the ballroomesque master bathroom. That's because she says that I stink!