I have used Priceline 3 times and was happy with all of them. Of course, I didn't have my heart set on a certain hotel either. I used betterbidding.com to see what the most probable locations would be and then used tripadvisor to see reviews of those. As far as having two beds, I called all 3 as soon as I got the confirmations and they put my request in for two beds. I got two beds everytime. I asked if it was possible to NOT get two beds, and was told by the hotel that that was only if I didn't request and there weren't any double rooms left when I arrived.
Marsha