The rooms are amazing. They are literally treehouses! The rooms are beautifully decorated and include universal outlets, running hot water, and a set of stairs to keep out unwanted guests. The rooms are spaced out fairly far from one another for privacy (~30 yards perhaps) which gives a neat isolated feeling. Security guards will escort you to and from your room for your own safety, but we never felt that we were in danger. Lions wandered around our particular room, we saw their footprints in the morning!
The lounge area overlooks a watering hole that various animals use. I personally saw a small group of waterbuck use it one morning. The reception area is built around a tree that houses a colony of bats. It was very cool and the bats keep the mosquito population around the lodge very low, which was much appreciated. Guests can watch them come out at night, although they are also easily avoided if you aren't a fan of bats.
My group did a night-time game drive, which was definitely worth the extra cost. We saw lions, a genet, a chamelion, a springhare, an owl, and other animals. Some of them only come out at night, and the Maasai guide found things with almost super-human sight.
The staff here was extremely friendly and helpful. We got to know the waiter that was assigned to us, and learned a bit about the people that live in that part of Tanzania. The whole place is well-run and takes being environmentally conscious seriously without compromising the guest experience. The food was some of the best I've ever had, and each meal featured a local dish as well as a vegetarian dish for those who require it. I plan to return one day!