Jenna was shaking her head by the time we reached the fourth floor, where the three of us would be staying. Cal was shown to his room first, and Jenna burst into giggles when we peeked over his shoulder. The room could not have been less Cal.?? I mean, I guess the hunter green bedding and drapes were kind of masculine, but the spindly gold-and-white furniture was definitely not. Nor was the giant ruffled canopy over his huge bed.
It's an idiomatic expression meaning that the décor of the room was totally unsuited to Cal's personality.
It was nothing like what he would have chosen for himself.