I have stayed for a long time (+1 month) at Wayne's place, so I can give a clear review of it.
COMMUNICATION : very smooth, fast responses and very willing to help and accommodate any request.
CHECK-IN: I asked for a early check-in, which was no problem. Wayne will provide access codes for the door. You don't need a key to access the apartment, only the code. This was in my opinion quite useful, as I didn't need to worry about forgetting a physical key.
THE LOCATION: very unique spot. In a very cool laneway. The outside is decorated by nice green plants. Expect a lot of people taking pictures of it. It's in the heart of the CBD, close to everything. Major tram lines in minimal walking distance, as Melbourne central rail station. Close to the shopping street.
THE PLACE: it's a one bedroom warehouse loft style. A big open space. It has a bachelor pad vibe, with a nice TV setup, Apple TV and surround sound system. Note that the bed is also in the 'living area'. If you are staying with multiple people, don't expect any privacy. However, for a single traveler is this not an issue.
The kitchen has every thing you can need. Didn't do a lot of cooking, but it's supplied by a set of pots an pans. The pantry is also stocked with various items, maybe you can find something usefull for you dish.
Bathroom is simple but functional. The shower has a steady stream of (warm) water. Soap and shampoo are provided.
Laundry cabinet as you expect. Ideal to do small and medium washes.
The wifi is stable enough to stream Netflix, but don't expect more. Upload speeds were on the slow spectrum.
The appartment stays quite cool in the summer, but if you need airco, it's available and does a very decent job!
So far so good, but there is one huge remark :
THE NOISE. the windows are not well insulated. In the morning you can expect reversing trucks, offloading goods, cleaning machines and others to disturb your sleep at any time in the night (ranging from midnight to morning). If you are a light sleeper, this might be an issue. During the day you will hear people walking in the lane.

On the other side, if you managed to sleep through the noise, you will wake up to the chirping sound of birds sitting outside the window. Quite unique in the city.
Same goes for the fridge, since it's all in the same room, you will hear it when it's cooling down it's content. It's not too disturbing, but noticeable.
TL;DR: great place to stay as a single traveler. Everything you need in a spacious room. Mind the noise if you are a light sleeper. I had a good stay!