Your own phone is the room key!

Once you have checked in, you will receive an email with a link to activate the room key on your phone. It remains active throughout your stay and then expires automatically, so you do not have to hand in your keys when you check out.

You do NOT need to download and/or install anything for this.

Besides the room, you also have access to the entrances of the hotel. you can share the keys with your travelling companions.