Vastu guidelines emphasize placement of elements in a space that enhances the harmony between elements.
The body is made up of 5 elements ( Earth, Water, Fire, Air & Ether ) , the world is made of same 5 Elements.
The primary rule is bigger space. the space element is the one that is not in any conflict with other elements.
Notice how if one is out in a bigger open space , like on a mountain or next to ocean, the prana level is high and one is more connected to self and therefore happy.
Similarly if the space where one is residing is big, open, neatly arranged this would undoubtedly have a positive impact on the minds and health of the residents.
The area should be complete square. No part of the square should be cut out.
Kitchen should be in South East portion of the house.
Bedroom in South West area.
Central area should be open and empty.