citizenM says:

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

on citizenM.com we use cookies to offer you a better user experience when you visit our website; these cookies also enable us to optimise our website and are used for retargeting purposes. our partners may place cookies on our website to collect your data, but it’s only in order to show you offers and things they think you’ll like. these cookies also enable them to maintain a profile of you. have a peek at our cookie statement and privacy statement if you’d like to know more. By clicking on "yes" you accept that you may be retargeted and third parties may maintain a profile of you. If you click on "no" you can still continue to our site, which then will only make use of functional and technical cookies.