If you don't want a view of the construction I would call and let them know that you would like a view away from the construction.
Since you are checking in so soon maybe you should call tonight.
I have only stayed on the Zebra Trail and I loved it! We didn't hear any construction at all.
Not to knock CRO but I would do a follow up call in a couple of days to make sure the request is in the system. Sometimes things fall through the cracks in the system. I want you to have the best possible vacation and would hate to see your request lost.
Arusha Savannah ( the main one) Zebra trail on the 2nd or 3rd floor you will be closest to the animals. Also get a room near the first break so you dont have arusha rock in front of you. HTH. Also call in with your request or email AKL yourself.