Room requests for DVC villas that were made using points are made by the member. The owner either calls member services or uses chat to have it noted on the reservation. If you booked a cash reservation, then your room request goes thru by calling Disney's reservation number and asking that your preferences are noted.
You can request a pack n play, high chairs, bed rails, etc by phoning housekeeping once you are in your room. Asking ahead of time is pointless because room assignments can change. So housekeeping doesn't place those items in your room in advance of your arrival.
I suggest going to
touringplans.com and checking the views for various resort view 1BR villas to get a feel for locations that might give you a glimpse of the savanna. Just remember that the more requests you make (high floor, near lobby, etc), the less likely you are of getting everything you ask for. You could end up with a top floor, near the elevators and a view of the bus stop.