I agree with Terribull - 'presenting a property in the best light is quite crucial to achieving the best possible price, in a way you are selling a lifestyle and need to stage the home accordingly'.
We have sold a few houses over the years. All of them sold quite quickly. All of the houses were 'presented' well.
I think you should remove clutter from surfaces and make sure the house is clean and tidy, especially kitchens and bathrooms. Don't have too many knick knacks around. Things like bookcases are different but I would make sure they look tidy.
Some people cannot see beyond what is already there.
I am always suspicious if there is a strong smell of air freshener or scented candles as it makes me wonder if it is covering up something. I would use flowers and open the windows prior to let some fresh air in (weather permitting of course). I think people are wise to the coffee and bread aromas now.
I also think that people are put off by pets, especially if they are not animal lovers. We had two dogs when we sold one of our houses. On the open day we moved the baskets and dishes from the house and made sure there was no doggy smell. It was quite easy for us as we had hard flooring.
Good luck with the sale 