Be sure all countertops are clear and "squeaky clean". Wipe down appliances. Be sure all dishes are in the dishwasher or cleaned and put away. The sink should be clear and clean.
Make up the beds, neatly and attractively, every morning. This is a job you don't want to have to do when you learn that the buyers will be there within the hour.
Keep a set of fresh, attractive towels in each room that you can change instantly.
Soft, pleasant background music may be very effective.
Even those in closets and storage rooms. Electric lights have an amazing capability for creating an illusion of lightness, airiness and largeness. Install new bulbs if needed.
Certain smells can trigger memories in a person, the scent of your home can leave a lasting impression on a potential buyer. Keep kitchen odors fresh: coffee brewing or a cinnamon coffee cake baking in the oven have a lasting, inviting effect. Keep air fresheners in closets, bathrooms and kitchen. Avoid cooking smelly foods such as fish, liver, garlic, onions, or anything fried or spicy before showing your home. Also, stay away from sharp floral scents
If the weather is warm and muggy, have it operating.
If you have pets, keep cages, dishes, and litter boxes clean at all times. Pet hair should be frequently vacuumed. Doggy droppings should be scooped up from the front lawn and disposed of... And always cage or kennel pets when your house is being shown.
Do all that you can to create a bright and light ambiance.
Water and mow the lawn on a regular basis. Trim the trees/rake leaves/plant colorful flowers. Put the car in the garage, or park it on the street, to provide ample parking for prospective buyers.
Make sure you leave just prior to the showing. It makes buyers very uncomfortable to look through a property with the homeowner still there. They will rush the showing and not thoroughly look at all your home’s features.