Just say upper floor, far, far away from elevator, across from busstop, and hope for the best.
I think the "corner" (which is a dedicated 1 br, so don't bother requesting it) is X123, but I could be wrong. I know that we were in 4079/4081 which is a 2 br std view. We were too close to the entrance to see anything other than the VERY highest of fireworks -- BWI blocks your view. I felt that if we had been down around, say, X100 and something, we would have stood a better chance.... HOWEVER -- be careful what you wish for! Some of the upper floor rooms down on that end have no awnings over their porches! That would really bug me... I like my porch as much by day as by night, and birdie doo ain't my cup of tea.
I admit it -- I was bummed when they gave me our room #s at the desk (and BTW -- there was no arbitrating to be done -- those were are rooms numbers, end of story! No offers of other rooms if we waited, as you may have heard some folks state... CM wasn't rude, but she was firm -- here's your assignment, it meets your criteria, Enjoy!) But.... it was kinda nice not having to make the long haul to our room at night, and honestly, we were only in our room one time when the fireworks were even an option... The only other night we were in there at that hour was during Hurricane Charley (and nature was doing its OWN "show" for us then!)