We (a family of five) stayed for four nights at this holiday home in Busselton.
It's about three houses back from the beach in a decent neighbourhood, and around a 30-minute walk to the Busselton pier, the longest such wharf in the southern hemisphere. So it's not right in the middle of things and you'll probably need a car, but I suspect most going to Busselton would have one anyway.
This standalone house, built in 1979, was very comfortable and clean. All the appliances worked well and were in good condition. Some of the fixtures and fittings seem like they're original to the house, but they are showroom-new. Others, like the oven and TV, are relatively new and pretty nice.
The house seemed well lived-in; there were plenty of books, board games, a modern flat screen HDTV, children's toys, and off-street parking in the front circular driveway. There's a great backyard area for kids to play in and parks not far away, easily walkable. The kitchen/dining area is a convivial place to hang out, cook a meal, and enjoy each others' company, while the four bedrooms make for a nice retreat when you need some alone time.
If I had to nitpick, I could comment that the house is not modern; it's from the late seventies, so if you're someone who likes new build then perhaps it's not for you. Again, it's in excellent condition though. I might also reiterate that it's not right in the middle of things if a central location is important to you.
Having said that, I have fairly high standards when it comes to accommodation and I wouldn't hesitate to stay here again. Not for a second. I would also add that our host Beth was very accommodating and helpful.