The Sydney Harbour Marriott is conveniently located a few blocks from Circular Quay. As a tourist, it was a perfect place to stay--easy to get to the ferries, close to the rocks, the bridge, and the opera house. It's a very comfortable 32-floor hotel with great views of the harbour and Sydney Opera House.
The week we were there, the hotel was hosting a large conference for a Japanese company. The hotel was completely full. We had booked a room with two double beds, but they only had a room with a king bed available. After much complaining from me, they gave us a corner room and offered a roll-away bed. The next day, they moved us to an upgraded room on the 27th floor with an Opera House view.
The room was very nicely appointed with beautiful, arty pictures of the Sydney Harbour Bridge and Opera House. We had a bathroom with a large tub and shelf area. The room had air-conditioning, cable TV, minibar, safe, tea, and coffee.
The only other complaint I had was when we left the room early one morning and returned at 6pm to find the room had not been cleaned. However, after I called to complain, they sent someone up immediately to clean the room.
I've known other people who've stayed there and had no problems, so I'm sure we just had some bad luck. And to their credit, they did work hard to fix our problems.
Even with all our problems, I would definitely recommend the Sydney Harbour Marriott. Its convenient location and the views from the rooms are its best selling points.