Here is a recap of Anna Beaudry's 2 day intensive workshop on Architectural Photography using a DSLR.
Bounce any supplemental light you might be using, off a neutral wall.
Use available light.
Any of the above.
Keep your camera level.
Keep your camera's sensor plane parallel to the subject.
Keep your camera's sensor plane perpendicular to the ground.
All of the above.
Beneath the furniture.
Between the furniture and the camera.
14mm to 50mm
Wider than 14mm
Longer than 50mm
Here's an interesting quiz for you.