I stayed at AKL in June 2003, and loved the hotel, although there are almost no teens there, at least not that i saw. I think I ran into 5 different teens at AKL in the 11 days I stayed there. But at least the three girls I talked to were great.
The atmosphere at the hotel is great, and if your room has a savannah or pool view, you should be quite pleased. Our room was on the second floor overlooking the smallest of the three savannahs. We had giraffes outside of our window almost all day long.
I only really have two complaints about the hotel. The first is that the bugs were horrible near the pool after dark. I have been to other resorts at Disney in June several times before, and never had a problem. It must be the added vegitation and the remote location of the hotel. The second complaint I had was that the Mara (AKL's food court) is only open until 11:00. When the parks are closing at 10:00, and it takes such a long time to get to the hotel from distant areas (MK, Epcot, MGM, and Downtown Disney), how can you get something to eat before closing. At least with some of the other resorts, they are open until midnight.
Anyway, I hope you enjoy your trip.