Thoroughly clean all areas of the house:
Vacuum carpet,
Mop hard floors,
Clean countertops,
Clean windows, inside and outside
Clean mirrors and anything that shows the dirt on it
Turn off ceiling fans and make sure they are clean
Remove remote controls
Tidy/hide all power cords/cables
If you have a fireplace be prepared to light it
Remove seasonal decorations that might date the photographs
Remove small floor rugs in kitchem, bathroom and by front & back doors to reveal the flooring