I think if the Illuminations view is the most important thing you want/need, then make that your only request. That way, the assignor(s) will see it's important to you and will hopefully do what they can based on availability. If you have secondary requests like "near the main elevators because of X reason", I would do that second with something like "and if possible, it would be nice to also have...." I have found with just my husband and I and our request of "a quiet room so we can truly enjoy our vacation" has been met about 99% of the times and when it hasn't, it's been because of our neighbors and Disney can't do anything about that.