We loved their system. The Sonder mobile app can be used as the hotel card key, as well as for any questions, requests, and stay info. Having a full size refrigerator, microwave, stove, and a washer and dryer all in the room made our stay much more easy and pleasant. The place is clean, looks brand new. I would definitely recommend it and I plan to stay at their hotels if they are an option in other cities we plan to visit.