I'm a frequent traveler to Hawai'i (mostly for work) and decided to stay here instead of our normal hotels. I'm glad we did. This end of Waikiki gets shunned too much and its such a great spot, easy access to H1, great views, and its a lot quieter. Was great just walking to the zoo & beach without dealing with too many people. Hulas is also a great bar (as long as you are "open" to other lifestyles) with cheap & strong mai tais. Matt's communication was great and we had 1 minor hiccup, it was resolved fairly fast.
My only other recommendation is pay for the parking. At first I figured I'd just fight with everyone else for a spot on Kapahulu or pay for parking @ the Zoo lot, but the city of Honolulu changed the hours for overnight and I really did not feel like getting up at 6am to move my car. Zoo parking is also $1/hour, so $25 for Castle Resorts is fine.