Originally Posted by Rose_P

I agree with this very practical answer. I'd also add that in most average houses where we live, especially newer ones, 14 X 15 is a generous size for a guest room. You should be able to have a piece of furniture, such as an armoire or bookcase, that would attractively house some of your supplies, unless you have guests in there so often that it wouldn't be convenient to get in there when you need the stuff.