If you're thinking, "I need to sell my house quick, without the paperwork", then you'll probably settle for very reasonable prices just to make it happen. You have to think like a homebuyer as you survey your house's features, though. If you've scouted potential homes for your next residence, then you've probably gleaned enough experience to know prospective buyers will put a premium on the condition of your bathrooms and kitchen.
You don't even have to renovate your fixtures and cupboards; you only need to make sure everything is spic-and-span for the walkthrough. Scrub the ceramics and clear the countertops; take out the trash and throw away rolled toothpaste tubes. The smallest details will make a difference on the overall effect, so make sure your bathrooms and kitchens are clean and cluttered when your guests walk in.
Yes, you can sell your house fast at the best possible price but you'll only guarantee it'll sell according to its market value if you ensure all the rooms are used as intended. You can't advertise a four-bedroom house and offer three bedrooms and a storage room to your guests. Even if you're better off using that spare room for putting away sundries, your buyers still need to see what they're really paying for.