1, avoid insolation of the lamp joint.
2, lighting should not be too much
3. Avoid having no windows
4. Avoid rushing to the bathroom door.
5, should not choose dazzling color.
6. The toilet should not be located in the residential center.
7. The bathroom door should be opposite to the kitchen.
8. The bathroom direction should be consistent with the residential direction.
9, toilet facilities to avoid irregular shape.
I hope my answer is helpful to you.