This place is perfect for one person for up to a month (even more), or a couple for up to 2 weeks (with a child, probably a week).
Has all of the basics you need; I liked the minimalism of the space.
There are trains - metro/city rails right outside and regional that go over the metro rails. So, a double-edged sword because it is super convenient to use the rail system, but there is train noise. You get used to it (I was on the 19th floor, and I could hear them, but it wasn't so bad).
I would recommend that they get real speakers for the TV (or a TV that can bluetooth connect to the small speakers most travellers take with them).
Finally, this place is a bit like a hotel, except the front desk is only open from 8-6, so if you have any problems getting in after 6, you'll have to call the security company and pay $100 AUD to get into your rental unit.
Overall, very happy with the cleanliness and minimalism and the location - perfect for the Australian Open!