When you are editing your interior shots, are you bumping up the shadows much? It doesn't take much before things start to look at little bit altered, but it brings so much more detail into the shot. Just curious what others are doing?
For real estate, everything I've ever come across says to light the room up a lot. Assuming you've applied an appropriate amount of light to make the room bright and airy, then the only concern you should have is that shadows don't appear to be hiding anything. Bringing them up to provide detail, without seeming unnatural, would be (IMO) a reasonable thing.
What does your client want? What do you see in House and Garden and Architectural Digest?