I had 3 nights left on hotels.com and l booked 3 nights in CO. Now they refuse to give me my free night because of my email address. I didn't know that l was an email address and not a person apparently. I have read other reviews and they all say about the same thing. Hotels.com is a RIP off and l am going to use booking.com from now on because at least they treat you like a person, not an email address.