Fantasy Room
Yes, they all are a fantasy of sorts. Just don't run the stove, microwave, PC and TV all the same day or you'll drain the batteries so much that your guest will have to eat by candle light. Instead space those activities out throughout the week to save power.
Oh, yeah and don't forget, if you like living in Ohio or farther east you will have to wash your clothes by hand, cook over a wood fired stove and again use candle light. Other than that, off the top of my head, you can enjoy a solar powered house. NO PROBLEM!