According to Vastu Shastra all of floor apply influence. The internal parts of flat should be construct according to Vastu.
Some tips of Vastu Shastra given place and direction under bellow :
Pooja Room/Kitchen Room/Bedroom ----- Direction
Pooja Room ----- North East.
Kitchen Room ----- South East.
Bedroom ----- North North West, South, North North East.
Store Room ----- North East
Study Room ----- South West
Toilet / Bathroom ----- South South West and East South East.
Drawing Room ----- West Direction.