If you have savanah view, do not request "ground floor" because there are no rooms on the ground floor. That is where the under-building parking lot is. Some like "lower floor" for more direct view of animals and others "higher floor" for more of a panoramic view. Both are fine.
Personally, I am not particular as to which floor I get with savanna view and do not want to waste a request on floor level because it is far more important to request a location at Kidani unless you like walking forever to get to lobby, bus station or pool. You should also probably avoid a "close to lobby" request. The problem at Kidani, now due to knowledge that the building is enormously long (about two-thirds of a mile end to end), is that large numbers request close to lobby and do not get it because all such requests cannot be met. When they have a location request that cannot be met, they do not then try to find something close to what was requested. Instead, they just go directly to any available rooms, which are often ones near the end of the hallways, far from civilization. Location requests one might try are (a) close to the Timon elevator, which is on the south wing and provides fairly easy access to bus station and acceptable walks to lobby and pool, or (b) close to the Rafiki elevator, which is on the north wing, and down that elevator to ground/parking lot floor leads to a walkway that provides shortest walk from the building to a pool gateway, and your room will be within striking distance of lobby and bus station.