Replace any broken switch plates. Those that will be sold with the home should be in good working condition. If specific equipment doesn't work and you don't intend to repair it, point this out. Leaky or noisy toilets should be fixed, as well as any dripping faucets. These should be working properly with no defective heads.
Openness stimulates positive feelings in buyers.
Overstuffed rooms or closets give the impression of being smaller than they really are. You can't change the size of what you have, but you can try to present it in a pleasing way. Open up your storage areas by removing items you aren't using. This applies to bathrooms and kitchens with the kitchen being most important. Store infrequently used appliances.