I recently stayed at WS Louvre – Casanova, on a girl’s trip to Paris. Three of us stayed comfortably, in one of their apartments which featured two sleeping areas (one room with a double & one room single), a small kitchenette and bathroom. The space was clean and comfortable. Location is great and very walkable to many of the key attractions.
As mentioned in other reviews sound is a bit of an issue. This is a high traffic area (both foot and car) and you can easily hear horns, cars, and even the conversations of those walking by outdoors. Not to mention the incredibly loud overhead fans, that did little to cool the apartment, so eventually we just left turned off.
These complaints were small though in the scheme of things, and the positives greatly outweighed. Check in was easy, and overall we were very happy with our stay. Would definitely book again for future trips to Paris.