Beware of Signature Plus rooms! The window wouldn't open, and the only way to get the breathing air was through the AC - a cheap junky unit, not efficient but noisy like a hell. These "Signature" rooms must not be used for anything other than the storage.
When I entered the room, it was like a sauna, hot and humid. For me it was a health hazard. The concierge left before 23:00, so there was nobody there to talk to. I called the emergency line but was only told that the hotel was fully booked and nothing could be done.
Window could be open in a Superior room booked by another member of our party, and the AC was a bit better there, although still of an under-the-window noisy type.