I stayed at the Sonder overnight between two long-distance trains. If you are traveling through Union Station, this is a perfect option. It’s basically across the street from the station, and it was also good for some low-intensity exploring in the area. The room was clean, comfortable, and since I was between train trips I really appreciated the opportunity to do laundry in my unit.
I was skeptical at first of the app-driven check-in and check-out. There are no employees at the location, although I assume if something goes wrong they can send someone. But it all worked without a hitch, and I’m sold on the concept now.