I was just there last month - first time. We were on the 5th floor, and I wondered if the 2nd or 3rd floor would have provided better viewing. 5th floor is above the tree-line, so further out into the savannah you're looking at the tree tops.
Also, we were quite a way from the lobby. Parked by the Pumba elevator, for those familiar with the parking garage. It was quiet, but was not convenient to get to the lobby. That one is a toss-up; I can see pros and cons to either.
We did enjoy our stay there.