We recently stayed at Beth's place with our two small children. The cottage was perfect for us, with a cozy living room and kitchen, plenty of bedrooms and lots of room to run around outside. We loved the play house, trampoline and swingset as well as the bins of toys and books inside. We also enjoyed the DVD collection - my kids watched Home Alone for the first time and loved it! The space has a lot of light and the kitchen is well equipped. The only thing to note is there is one bathroom, so if you are a larger group, that could be an issue. You will also definitely need a car as places are quite spread out in Margaret River
Beth recommended we stop at the Bunbury Farmer's Market on our way to her place and I'm so glad we did. It was one of the best grocery stores I've ever been to and a great place to stock up on food as there is not much near the cottage. We enjoyed many meals at home. Beth also recommended we go to The Berry Farm and Voyager Estate, both of which were can't miss.