The CitizenM hotel at Gare de Lyon was extremely clean, comfortable, and stylish. The description in the listing is accurate. The room controls via app and iPad were convenient. The WiFi was very good. They do not use cash at all, something to get accustomed to. I enjoyed the CloudM sky bar for the service and the view. The staff are welcoming and knowledgeable. They all speak excellent English.
The King Room was a good size for me, but it could be a challenge for two or a large person (especially the bathroom). Overall a great value for staying in Paris.