The unit is located in the farthest wing from the pool / lobby. We had trouble sleeping at night. It overlooks 2 parking lots (the Aston's and neighboring hotel), and tennis courts. People played tennis every night and early morning (to beat the heat). They made a racket! Then there were early morning trash pick ups and other loud vehicle/city noises. The bed was not comfortable. My brother stayed in a different unit in the Aston during our visit. His place was SO SWEET! Comfortable bed, lanai overlooking the lush gardens and ocean, big, comfortable space. He paid $50 less a night than me.
About the Aston: We LOVED the gardens and grounds. It is lush and full of birds and lizards. The pools are nice (though cold in February). Despite pictures, there is not great beach access here (there's a tiny sliver of beach in front of neighbor hotel that is being maintained with giant canvas material). It's not on the Ka'anapali Beach Walk - it's about a 15 min walk (on road) North of it.