I shoot some pretty high-end stuff, for both luxury vacation rentals and finished projects for exclusive interior designers.
My rule of thumb is that eye level creates a very dull perspective, always (well, nearly). Read on...
I'll generally shoot somewhere between stomach and chest height, depending on how much ceiling/floor I'm looking to capture. This makes for a fresh angle, a new look on everyday things. So much of photography is in the mind, photos vying for people's' attention, and they don't always understand what drives them
The one exception is for the kitchen. I don't remember where I saw this bit of psychology, but a kitchen is the one room that people will nearly always be using waist level surfaces (table,counter,cooking) from eye level. Subconsciously, the only comfortable perspective in a kitchen is from eye level. I always stick to this.
Obviously, all this is only for space/room shots. If you're shooting details, there are no rules.
Good luck.