We had lunch today and the Elephant House Cafe. It is a lovely space with very high ceilings and huge south facing windows. It is full of University of Edinburgh students working away on projects. They seem very tolerant and don't seem to hurry anyone along.
The claim is the J. R. Rowling worked on her first drafts of her Harry Potter series in that same sun lit room with her daughter asleep in the chair beside her.
It is a great spot to chill out for a while and it has a great view of the castle. It is on the George IV Bridge which is quite something onto it's self. The street runs north/south and the east/west streets and is about five stories above the east/west streets. So what seems to be the ground floor in the photos is actually the fifth floor.
I think you have to see it to understand it.