Yeah, they have a downstairs or another room. There is a door in the hallway between the kitchen and the bathroom. You can see them go in there all the time. The light will be coming from the hallway there and there is a door that opens up.
Look at the map. That room is their WC. It is small. Probably only a toilet in there. Room enough for one person. That's why Lora sits in that hall sometimes.