According to Vastu Shastra the suitable place of bathroom ( toilet ) South South West and East South East direction are best. The direction of zone is one of the Visarjan. This type of place's of bathroom gave negative energy. This type of directions is effected for wealth, health and education purpose.
If there bellow direction of such type of bathroom than you should fix two seats in a one bathroom. First seat at South South West corner and second beside it's right side. When you enter in that bathroom first seat beside left side and second is in your right side.