I will say traditionally the bathroom door separating it from the living space had split hardware. In this case the living space doorknob would be brass and the bathroom doorknob would be satin nickel. For the door hinges, I would let the door swing dictate whether I went brass or satin nickel. An inswing door, that is one that swings into the bathroom, I would go with the bath fixture finish (satin nickel). For an outswing (one you pull toward you) I would go with the Living space finish (brass). Basically I would let the finish of the hinges be dictated by which side of the door you see the hinges when its closed. Hope this helps.