Misunderstanding "bathroom"

Foreign tourists has considerably increased in the last few years in Kyoto. 
Yesterday, there was such a thing. 
Three foreigners had been stopped in Kyoto Station underground mall. It was like looking for something.
I said to them, "Can I help you?" 
Then, the woman said, "bathroom".
I guessed that they would be looking for the bath and inn. 
One of them said "toilet". 
So I was reminded. "Bathroom" also means toilet.
I guided them to one nearest toilet. They said to me, "Thank you!"

In Japan restroom is called the "toire"(toilet) or "otearia". 
I misunderstood "bathroom" (^_^)