We stayed 2 nights in Sergio and Shin's apartment.
This apartment is fabulous! It is actually located on the 62nd floor of a skyscraper.
The space is really well organized, and the we loved the zen interior design.
It is located in the central area of Melbourne, and it is close to the southern station (the bus for the airport is 5-8 minutes away).
We really enjoyed the free swimming pool and the sauna at 33th floor :-)
For those who plan to rent a car, it would be better to check the cost of parkings nearby (we reached Melbourne by car after a visit in Phillip Island, but decided to return the car as soon as we arrived, instead of the next morning to avoid extra costs)