100% agree with the below and previous comments re: Marriotts in Montreal.
If flights are already locked to YUL, consider renting a car and driving the ~3 hours to Quebec City and staying at the Fairmont there and/or popping the question somewhere in QC area.
Originally Posted by
BostonFlyer1624
The Chateau is nice - as noted by all - but not luxurious. I would spend a few $$$ and get a nice hotel - none of the Marriott's are glamorous.