London is a great location for anyone looking to learn more about the occult. There are so many great libraries around and lots of shops that sell all types of oddities, where you can find some hidden gems about demon summoning if you know where to look.
Rent prices are abyssal though. I would need quite a bit more space in my apartment to hold all the books that I own. Now they are lying around in stacks of questionable stability everywhere, and it's a nightmare to find anything I am looking for. That's why I prefer to do most of my research in the library. If you find a spot hidden far enough in the back, you don't tend to be disturbed by other people either.