Is this sentence correct?

I find the word choice odd. A bathroom is a special purpose room that is defined by its contents -- it has a sink, a toilet, a bathtub or a shower (usually). So what you have said is the room has a different room in it.

To fix this, you need to change the first room into a word that means something more than a single room. The house, the apartment, the flat .... Or you need to say specifically what the room has: The room has everything, even a toilet and a sink.