Poor Air Quality in the Rooms
I stayed at the O because I was attending a conference at LA Live and didn't book the JW Marriott in time. I really had no trouble with the hotel or the staff. However, when I checked in to the room there was a really distinct and weird smell. A couple of other people at the conference mentioned the same issue.
After a few days of sleeping in that room, I now have a weird chest cold that is reminiscent of when I stayed in a room with a mold problem in Mexico after the hurricane.
The room is also incredibly dark (very poor lighting) and if you try to open the drapes, you'll see that you look out into basically an elevator shaft.
They definitely have something going on with the air quality.