The Marriott Circular Quay is well situated for touring Sydney, and for many business appointments. It is about 150 meters from the Circular Quay train station and ferry docks. The opera house is just another 250 meters beyond the ferries and a lovely botanical garden is also nearby. In the heart of downtown, all major services are available in a short walk: banks, restaurants, etc.
I stayed at the hotel twice about 3 days apart. Each time, my room was attractive on a high floor. One view was of the harbor bridge. The other overlooked the opera house.
The concierge lounge had a decent selection for both breakfast and after-work snacks (which you could make a dinner of if you didn't want to go out). The lounge itself was attractive with spectacular views in all directions. Several people attended to the lounge guests keeping it tidy and the food offerings replenished. It can get crowded at peak times. And lounge access comes at a premium -- unless you are a Marriott Gold or Platinum member.
Room Tip: Go for a high floor to be above the lower buildings affording a more commanding view.
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This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC