Easily big enough to accomodate three couples and three children - each room has its own bathroom, although the downstairs bedroom is not actually ensuite. The in-laws were in the beautiful outside cabana which meant that they could ignore the crying children each night, and each set of parents had their own king bed so no grown up arguments.
The house is a stone's throw from Four Mile beach - ideal for walks, swims, kite boarding etc. There are numerous catering options within an easy walk - restaurant/pizza takeout/amazing cocktails just round the corner; morning coffee/beautiful lunches about 5 mins walk. It is a drive into the centre of Port Douglas but that suited us and parking was very easy and free.
The pool was a great hit with the children and a good size for doing a few laps to work off all those cocktails.
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