citizenM says:

we use cookies (we also sell cookies in canteenM, but that's another story)

When you visit our website we may use marketing cookies and other similar techniques to collect data about you. We collect this data in order to show you offers and things we think you’ll like.
Our third-party partners may also store tracking cookies and/or social media cookies when you visit our site. These cookies are stored on your device or in your browser may be used in a number of ways, including but not limited to, optimizing the user experience; tracking Internet behaviors on and outside our website; providing targeted advertisements; enabling a “like” button, etc.

By clicking “I agree” you consent to the use of these cookies. You can withdraw your consent at any time by setting your browser to disable cookies and/or to remove all cookies from your browser. Please read the Cookies section in our Privacy Statement to learn more about the cookies used on our website.