Likewise animals should, if possible, be removed. In particular dogs can cause unwelcome disruption. It is important to remember that many people dislike animals and will find your pet's attentions annoying. Before clients arrive go from room to room and turn on as many lights as you can. This gives a warm and welcoming glow.
Nothing is more off putting than dark dingy areas.
Green pot plants can also add a pleasant touch as can vases of freshly cut flowers, particularly if they come from your own garden. Have soft music playing in the background. This works in much the same way as piped music in supermarkets, lulling the buyer into a relaxed state and ensuring they're more amenable to making a purchase. Nothing is as offensive to any visitor to your home as unpleasant smells. For this reason make sure the house is well aired.