Furniture and footpaths leave their mark on floors. The same goes for pictures hung on walls. Keep utilities going. No place looks homey in the dark, or feels homey when it's cold. Provide standing lamps for rooms without ceiling lights.
Prospective sellers like to turn on faucets.
In colder areas, pipes can burst in an unheated house. Maintain the exterior. Make sure the lawn is periodically groomed, and garbage or debris are taken away. A garden can turn into a jungle over a summer. Inc. All Rights Reserved.