Stayed here in October 2013 as part of our honeymoon for 5 nights and had a fantastic experience! The service was spectacular, the elevators have the nice security feature of requiring a room key and our 5th floor room was quiet, modern, comfortable and large.
The only night the club was loud was Saturday and I expect that is a problem for people on the 2nd and 3rd floor rooms, but it was completely unnoticed on our 5th floor room.
Location is great- St. Laurent has a plethora of restaurants and clubs. If you're up for a run, it's quick to Old Montreal. A metro station is a 5 minute walk away that gives access to the rat of the city.
Only one negative experience was my last night; my wake up call for 4:45 AM occurred at 5:22 and the night auditor tried to convince me it was 4:45 "according to his phone." Then he immediately called me back to tell me my cab arrived so when I went down, we had a chat and he admitted it wasn't 4:45 when he called and that he couldn't because he was "too busy." I loved this hotel, but this guy's excuses were lame and could have cost me making my flight, thus knocking off the 5th star.