I'm partial to the Kudu Trail and Zebra Trail rooms, especially rooms on the third and fourth floor (closest to see the animals). These room locations afford the largest views of the savannah area. Within the Zebra Trail guest rooms, room numbers *423 -*437 and *501-*515 are what I'd request. The * is for the floor; a second floor room would begin with a 2 and so on. In the Kudo Trail, I like room numbers *226-*241 and **301 - *315.
To try to summarize this, in my room request I'd say I'd like a room within the range of 3423-3437, 4423-4437, 3501-3515, 4501-4515 on the Zebra Trail. On the Kudo Trail I'd like room wtihin the range of 3226-3241, 4226-4241, 3301-3315, 4301-4315. With a broad range of rooms like this, you have more chances of having your request made.
Disney Dad Bret has a great explanation on making a room request; just click
here
Enjoy the Animal Kingdom Lodge; it is an amazing experience!