Bathrooms are great for collecting information, for some unfathomable reason, but are useless for Bugging.
As with all other rooms, the layout of a Bathroom is randomly generated when the Hideout is first created. However, most Bathrooms tend to contain one or more of the following pieces of furniture:
Each piece of furniture may or may not appear in each Bathroom you encounter. There may be more than one of each, as well.
Note that Toilets will always appear up against the east or north walls of the room. Sinks will always appear up against the west or south walls. Bathtubs may occasionally glitch and be placed on top of the east or west walls, but are generally placed away from the walls.