As long as you book 11 months out, you will not have a problem. If you wait much past 11 months out you can often have problems for the highly popular, lower-point-cost standard view at BWV which is only about 20% of the rooms.
If what you are talking about is this year, be aware that we were actually looking into availability for a standard studio in November or ealy December for a relative and we checked on line and found that most days throughout November and first part of December are already fully booked with some openings in last half of Nov (15-19, 23-25).