My partner and I stayed for a week over Christmas/NY and found it a great base for our time in Melbourne.
The apartment is well located, a very short distance from the "Paris" end of Collins Street. It was spotlessly clean and well equipped with ample storage, washer/dryer and a great bathroom with good water pressure.
Note that there is no parking in the apartment block by default - I missed this. The host Chris was super helpful in arranging discounted parking for a public carpark. In fact Chris was thoroughly helpful and communicative throughout.
The only minor niggle was the air-conditioning which was too loud to be used at night - recommend cooling the room before going to bed as the apartment does get warm.