Gill and Greg are wonderful hosts, very accommodating with arrival times, exceptionally friendly and have a wonderful cottage, right in the quiet heart of residential Subiaco. They're very responsive, have lived in Subiaco for years and have lots of advice on what to do and where to go. Greg is a half-decent cello player (!), so any concert he's playing in is definitely worth going to.
The cottage is quite large with an upstairs room (2 beds and a table) and downstairs is the open living and kitchen area, with a bathroom (toilet and shower). Outside, the courtyard is shady and spacious, and entry/access via the back gate means not disturbing the hosts and more privacy.
Amenities-wise, the cottage has fast wifi, a very well-equipped kitchen with probably everything you will ever need for your stay, a washing machine, large fridge-freezer (cereal and milk was a wonderful touch), a proper gas stove and electric oven, and a microwave. Hot water comes very quickly, and in the 14 weeks I was there, the internet connection only disappointed me once. A/C is only upstairs and a ceiling fan downstairs. I stayed during the Perth winter which gets chilly at night, but the A/C had no issue heating up the cottage.
Close by you have the cafes and shops of Subiaco. Nearest supermarket (IGA) is about 10 mins walk away. Daglish train station is also close and gives you quick access to the centre of Perth, or the seaside town of Fremantle. It's perfect for the QE2 campus or UWA - either walking or a quick cycle - and G&G have bikes they let me borrow.
I thoroughly recommend staying at the Twin Gums Cottage.