Personally, I prefer the world's of my stories to be entirely fictional. I find trying to base it in the real world (In a city like London, New York, Paris, etc) limits my imagination, and causes me to spend more time researching that city than I do writing the story. When I create my own world, I can make the world wrap around the story. I can invent things as I go instead of having to stop and go look up real world places to base a specific scene in. How do you feel about this topic? Do you prefer real world locations, or fictional locations created by yourself?