The front door lock worked great. I chose Room 1 for its quietness and roof terrace. It was indeed quiet, and also airy, fresh, dark at night and light by day. Trains hardly noticable, and almost none at night. The bed is different - I think better than the wood/rattan one in the photo, and there is a desk with a modern chair, fine WiFi. I recommend this room over the others.
Quietness in the staircases is still a must, as stairs and doors squeak a bit. The kitchen is great, though I had trouble with the hob (is being fixed) and the lack of coffee. If coffee is a must, I advise you toask Leo which coffee will cups fit, and bring them yourself. There is a fridge. The kitchen is different from the photos; bar swapped for one relax chair and a coffee table; the countertop is extended. So less seating (but who needs four bar chairs on a 1/2 person trip?) and more working space. The bathroom now has a shower stall. Toilet is separate, in the corridor.
For eating, I recommend Brasserie Royale with beautiful cathedral view, and the night store on the same corner for last-minute groceries.