For every modern house, there is a spare room called guest room. This room is not used frequently by the people living in that house. Guest room is dedicated to guests who visit you & wishes to stay at your home for a couple of days. A guest room is designed in such a way that it reflects a beautiful & comfortable effect to the guest. Keep in mind the guest room to design & decorate it as that of any luxury class hotel room. For example
(1) Attached bathroom with fresh towels tidy floor
(2) Comfortable bed
(3) Trendy Sofa with adjustable side table
(5) Air conditioning
(6) A beautiful indoor plant at the corner
(7) Table lamps
Additionally you can also add other things of your interest like a piano or a home theater for entertainment purpose. One important thing that I would like to share with you is that you can also consume your guest room for commercial purpose & earn money with it. For example you can get paid guest or can give your living room to another party on rent. In big cities where living is expensive, most of the folks do this to cut cost of living. Infect this is a good idea to generate money with little hassle.