This studio apartment is in a great location -- on the western edge of the Marais, and it is very safe. It's in an inner courtyard so you are completely away from any street noise, but there can be some neighbor noise as is normal for apartments surrounding a courtyard, especially in summer when the windows are open.
The fixtures are all very modern and clean, and there are thoughtful touches like a coffee maker with coffee, sugar, shampoo & soap, and paper towels. I did not meet Leo but he was promptly responsive in communication via e-mail. This is a great place for a single traveler or a couple.