Your home is neat and tidy - great! But do you have excess furniture, or are your walls full of pictures?
You live in your home and you set it up the way you want it. But now you're going to be selling it, so you need to attract potential buyers. Buyers who see flaws will often calculate that into their price. They will be looking at all the rooms in terms of how to fit their own furniture and belongings. If the rooms are crowded with furniture or other items, it may make the size look a lot smaller than it is.