Americans often use the word "bathroom" to mean "a room containing a toilet", but "bathroom" in British English and its parallels in other languages (badeværelse, Badezimmer, cuarto de baño, salle de bains. etc.) means a room for bathing in. That is to say, it must contain a bath -- it may or may not contain a toilet too. It's therefore safest to ask directly: "Where is the toilet?"