Did a tour of Australia with my girlfriend and stayed her whilst in Perth. It was a little more expensive than I am used to per night but well worth the difference.
Amanda was a great host and has created a fantastic space for a traveling pair. The studio is a converted garage and has been finished to a high standard with a lovely kitchenette and bathroom. Couches and bed were comfy and we were supplied with plenty of towels and even some supplies for breakfast which was a lovely touch.
The studio is roughly 2.5-3km away from the harbour/bars and restaurants where you can get the ferry to Rottnest Island.
If I go back to Freemantle I would stay here!