The truth is, MS books 1 bedrooms for 5 all the time. You will NOT get extra bedding, but for 2 nights, it shouldn't be a major issue. Granted, BWV is a lot smaller than the 1 bedroom we had at OKW for one night with 5 adults. We were scheduled for 4 adults in a studio at OKW for one night (New Year's Eve), and a 5th adult decided to join us for the trip. It was no issue for the other 9 days of the trip, because we had a 2 bedroom for that, but NYE was the issue. I called MS, changed to a 1 bedroom, and they allowed the 5 in a 1 bedroom for that night. We brought along an airbed for the extra person for that night. There was no problem getting keys for all 5 for that night, and our DD put the airbed in the laundry room (possible at OKW, but not at BWV) for that one night. Even the bathroom situation was not an issue, since we had a late night, and no one got up terribly early New Year's Day. By the time 3 were done in the bathroom, the other 2 were just rising, so it was not an issue. We checked out of the 1 bedroom and into the 2 bedroom before heading out to the parks for the day, and everything was totally seamless. Perhaps you could reserve the 2 bedroom for those 2 nights only and then downsize to the 1 bedroom.