Lets start with a very important question regarding Guest room and In-law suites.
How long do you REALLY want them to stay? If you welcome the thought of being the favorite Bed and Breakfast for your friends and family, then this room will be approached much differently than if you have a one night patience level. The added expense of blackout lining for draperies can usually be avoided in guest rooms, unlike master bedrooms. Privacy shades or blinds will usually do the job allowing for more decorative window treatments to be used to balance color, pattern or texture.