Vacuum, sweep, make sure your windows are clean and bake cookies. My mom was a professional house cleaner for several years. People assume a house is very clean if there are vacuum lines in the carpet and the windows are clean. It shows that your home is really well cared for. My sisters real estate agent told her to bake cookies on the days she was showing the house (even if they are just slice and bake) because most people associate the smell of cookies baking with good memories.