One of my library conquests was a book on Feng Shui. Ideally, the garage should be separate from the house because the movement of cars disrupts the flow of energy in the house. I totally agree. Not to mention that it's a bitch to clean up tire tracks off of plush carpet. This is a good idea.
Spiral stairways are a definite no no.
As a whole, the thought of me falling down spiral staircases gives me the creeps. Also, stairs should not directly face the front door. They had the worst chi in the world. I rest my case. Obviously, the author has never played tag with their SO in their underwear.