Our first trip in 2001 was booked at exactly the 7 month window. I don't know if I needed to but I called day by day to add each day onto the reservation until our week was complete. I booked over the Christmas holidays that year and had less calling to do because of MS being closed on the holidays. It worked for us. I don't know about the 1 bedroom at 7 months out because there are not as many 1 bedrooms compared to 2 bedrooms. Good luck!