I'm not a native speaker, so I am not positive but, I believe you must use "estar" rather than "ser" for location. Ser and estar are often difficult for us non-native Spanish speakers because we only have the one word "to be" in English, and Spanish has two; we just need to commit to memory the rules for usage.Thanks for the help gdmarcus. Although I say "Donde es el baño?" because the bathroom is in a permanent place. Right??