Wonderful, wonderful experience at Marie's flat. I arrived with a stomach virus and she basically nursed me back to health with tea and rest in her house. Marie is over and above a fantastic host.
The room: Absolutely in the heart of La Marais. Doesn't get more central than this. Marie's apartment is exactly how it is described, plus clean, stylish, and with a cool view. Easy check in, just follow Marie's suggestions and you will have a great time in Paris. Highly recommended.