If you have pets, make sure their living areas are spotless and odor free. If you have a dog, keep him out of the house and under control during showings. Make all minor repairs, such as sticking doors, broken window panes, loose door knobs, plumbing, broken light switches, etc. Let plenty of light into your rooms to create a cheerful atmosphere. A moderate amount of heat adds a feeling of coziness in cold weather.
Fresh air is equally desirable on hot days.
If redecorating is needed, do it if possible. Properly done, it will create appeal and value. The home shows better if you are not present. The buyer feels more at home and less like an intruder if you give them privacy. Always be prepared to show your property.