A great decorative bed frame can make a huge and different impression. If your style is more elegant I suggest a bed frame that has great detail and in an off white color. For example this bed frame would be a perfect for this type of bedroom.
Focusing on the guest room - keeping it light and calming, with white/very pale wall color, iron bed frame and overall gentle and inviting. This image is a bit too shabby-chic, but the basics are there.