"Double room" normally only means a room for two people. It has two single beds or one double bed. Sometimes I've been asked what I want when booking a double room.
Here, however, they are distinguishing between "double room" and "double room". "Great place to stay" Reviewed by a Hotels.com guest on Nov 30, 2010 "The room was very clean and the bed was very comfortable. as opposed to unmarried ones, nor, for that matter, do you have to be married to sleep in the double bed). So it's a reasonable assumption that "double" is being used in this particular context to mean a room for two people with two single beds rather than one double. I do not think there's any more to it than that.
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