Right in the heart of Le Marais shopping. Go east to Bastille, go west to the centre of Paris, go north to Republique, go south to the river. Location is pretty unbeatable. 100% safe area, if there was ever a doubt. Check-in was easy. We were a half hour early but Mathieu set it up so that we had entry codes and the key was easily attainable.
My wife loved the bedroom, as the morning sun creeps through the south window (6th floor) - definitely spent a couple extra hours just lazing around, enjoying that. No elevator but it helps burn off that triple chocolate dessert, so it works. Wife also loved the tea selections in the house, I loved the espresso machine. Didn't use the laundry machines but easily could have. Super comfy bed + pillows. Also the most space I think I have ever had in a Paris AirBnB, haha. Highly recommended and I would definitely stay here again.