Staying as an IC Ambassador member, we were upgraded to a spacious room in the low-rise wing, with separate bath, and (rare for this hotel) natural light. The service was polite and helpful, including pointing out all the various features (electronic and otherwise) in our room - a welcome change from many other chains. We did not eat breakfast in the hotel (Melbourne has too many other fantastic options to spend time in a hotel), but did try the pool. Nice location on the top floor, but not really appropriate for laps, nor really relaxing, as it has no real view and is almost square in shape. The spa was very nice though.
The room we stayed in (333) looked out onto a floor of the next-door Rialto Towers, so not ideal for a mid-week stay, but over a weekend was quiet and provided natural light and privacy. The bathroom was particularly well-appointed with decent size bath and rainshower.
Ambassador Membership: Highly recommended. This weekend stay was part-weekend certificate, part-advance rate, and the staff processed it all seamlessly. We did the maths on an earlier stay this year at an IC in Thailand, and joining Ambassador was cheaper than paying for an upgraded room, so if you find yourself in a similar situation, it's highly recommended.