If you are in a savanna view room you will be in Jambo house, and may overlook Sunset, Arusha, or Uzima savannas, all of which have giraffes. You will be no higher than the 4th floor.
If you are interested in a savanna view villa (eg: studio, 1 br., etc) at Jambo House you will be on the 5th floor overlooking one of the above mentioned savannas. If you are interested in a savanna view villa in Kidani village, you could be on any floor and overlooking Sunset savanna - which has giraffes, or Pembe savanna - which does not have any giraffes.
IME at Jambo through the years I’ve been next to each of the 3 savannas and I’ve always seen giraffes, but they do move around, so you need to be patient & keep checking from your balcony for them no matter where your savanna view room/villa is located. I generally look for the trees where they hang the browse & then keep an eye out for the truck that puts the browse out because the giraffes will usually stroll by shortly thereafter. But sometimes they just wander by.