I have heard everyone who has transit through Gonzaou will get the hotel for free and that's like 1 hour away. I won't bother to travel if my transit hours is less than 8 hours considering all the hassles of taking visa, security checkins etc.. Only complaint which I heard from some of my friends is that people in the plane is not civilized. You can see some chinese people going directly to the back of the plane kitchen and eat there. Other than that I haven't heard any bad experience till yet.
You can use any online website such as priceline, justly, expedia, kayak to book it.
Also google has it's own flight reservation site..called https://www.google.com/flights/. Try everything and chose whichever gives you the cheap price.