Let's begin with the things we liked. The apartment is very conveniently located (it's pretty much in the heart of the CBD). Everything is quite clean. All the usual facilities are available (including the air conditioner) but on top of that you will have a small workplace. The number of sockets/available USB ports is just extraordinary (I honestly have never seen such a huge number per square meter). The bed is comfortable as well.
There is one fairly neutral thing. The hot water in the shower will only run for about 15-20 minutes (at least it is claimed in the provided manual). We haven't hit this problem but I would imagine that for some people it can be inconvenient.
The only real downside is surprisingly the location. If you are unlucky (and one night we were) you can get a party in one (or more) of many adjacent townhouses/apartments/night clubs/open air cafes/etc. The windows in the flat are not good enough to protect you from the outside noise (they do make it less loud but it doesn't help at 4AM). Given it's in the middle of Sydney's hustle and bustle I understand what I have signed up for and you should too.