But back to the original topic: The answer is that BOTH determine the room. After many PL stays, I've noticed that hotels frequently say something at checkin like, "That's for a king non-smoking?" or "You've reserved a smoking room." When, of course, I've reserved nothing of the kind. Basically, my theory is that with some or most hotel companies, when Priceline's booking engine does its thing, it has to book into one of their existing room categories, which, of course, vary. I suspect that part of Priceline's agreement with hotels defines the booking category of the room while confirming that it's just for technical purposes and that actual room assignments will be made at checkin. So it's just sort of a holding pattern, but front desk clerks aren't always aware and just read off what they see in the computer. The problem is that sometimes, particularly at 2* properties, they stick with what's originally booked. I've had that happen several times, and ended up in smoking rooms.