The Puja Place can be a shelf or a place where the images of Gods can be kept and worshipped.
You must make sure that Puja Shelf is clean. You should also keep a door to the Puja shelf or curtain, as its in the same place as your bedroom.
Also, you shouldn't keep footwear, dirty cloths or broomsticks near the Puja shelf as one must maintain the sanctity of the Puja Room.
The Pooja Room can either be an independant room, or an independant shelf or even part of a shelf.
Whatever is the Pooja Room, it should be in a clean environment and should be cleanly maintained.
It is preferable that the Puja Shelf can be kept in the East or North Directions. If both these directions are not feasible, the puja Shelf can face the West Direction.