We stayed in Karen's apartment for 3 nights. Even though Karen was overseas, she was responsive to our queries. Her husband Terry was there to help us in any way possible. Comfortable enough for 4 people. Bedrooms, living and dining area are comfortable. Her fridge was stocked up with all the necessities that we can freely use(milk,butter,eggs,bread,water++). And kitchen is fully equipped. The hot water in the shower might need some fiddling around with when the weather is super cold!
There's a free parking spot if you're renting a car. Highly recommend to rent a car as Shelley is a good 15-20min drive from Central Perth. Else you can Uber (cheaper than cabs).
Overall I would recommend Karen's apartment to anyone who would like to stay in Perth.