Forgot to mention this: go through your closets, cupboards (bath, kitchen, garage, wherever) and get rid of anything that hasn't been worn or used or is expired (like old medicines).

Wash/dryclean your mattress pad, duvets, bedspreads, and blankets. Flip your mattress and vacuum it. Give all of your bedding a serious cleaning. Take inventory of your linen closet and get rid of/replace the worn out, faded, and grungy. Something as simple as a nice new bathmat can be a big improvement.

I'm always surprised at the cobwebs that accumulate on ceilings and in corners. And ewwww... the pet hair tucked in corners always gets me.