The Hilton Adelaide is what you'd expect from a Hilton. Pretty spacious rooms, standard business class lay-out. The big plusses are the great location, friendly staff and good views.
The big minuses are super-thin walls. I was unfortunately kept up all night by a neighbor watching the Simpsons. Homer at 2 am is not funny! The staff didn't bat an eyelid when I mentioned it upon check-out. But I guess one can be unfortunate. Overall, I'd say it's a safe bet.