Absolutely fantastic hostel experience. I was out in Montreal to see Rammstein and chose the M as my accommodations for the two nights I was over
The place was pretty much immaculate! Excellent location, very well-kept buildings and rooms with no odd smells or cleanliness concerns. I loved the aesthetic. Beds were comfortable and just about big enough for my 6'2" self to stretch out. No trouble with being a top-bunk resident either as it's all very sturdy and not creaky whatsoever. The lights and outlets in our bunks along with the shelf and footlocker storage at the bottom were all fantastic additions that helped make this a top-notch visit. Everything is very clean, including the bathrooms, which housekeeping seems to take very good care of. There is even spare shower rooms in the halls in the event the bathroom in your dorm room is occupied
Communication was top notch as was the courtesy and friendliness of staff - I was in a bit of a bind during my checkout and needed something printed but they took care of it without issue and saved me a lot of trouble!
The amenities and activities here are fantastic as well. So much to do - whatever you're comfortable with
Plenty of great eats and such nearby as well as the Berri-UQAM and other public transit locations.
The folks I was rooming with were awesome as well. Everything went off without a hitch and I'll definitely be considering M Montreal again if I find myself headed back to Montreal in the future.