Very cute, clean, and bright studio in a great location. Modern appliances (there's a fridge and W/D) and furnishings. Has hairdryer and straightener. Bed was very comfortable, bathroom/plumbing was excellent. Couch looked a little dirty. The hosts provided bar soap and liquid body wash, so you might want to bring a shampoo. Very convenient to the metro (2 min walk). We ended up walking everywhere though (30 min walk to the Louvre). There's a bagel shop on the ground floor which is where the airbnb staff are (most of the this building seem to be AirBnb). Walls are a little thin.
The immediate block is quiet, but you have to check that the windows are closed correctly (they are door-style, which I imagine would be great for air circulation, but we went in the winter), so if they are ajar, you would be able to hear even just one person walking on the street. There's a very hip bar a block away which opens late (like a Barcade), so the overall area is not totally dead at night, which is a good thing. We noticed a couple of suspicious-looking women waiting at street corners late night, but they didn't bother us. No homeless people in the vicinity, unlike on the bigger streets.