I recently stayed at the Omni Mont Royal because I got a good price on a room during the winter non-peak season in Montreal. The room was clean and well kept but the tub had an issue with draining slowly. This issue was quickly fixed within a day (they came in sometime while I was gone). Housekeeping did a good job but would call the room (and occasionally knock) if I opted to sleep in and hang the "Privacy" hanger on the door to see if I needed anything. A nice gesture but kind of odd...
In terms of amenities the gym is open 24/7 by key card but the whirl pool is not open after 7 PM. Also, they claim WiFi is $9.95/night but you have the option of joining the Select Guest program (free) and receive free internet access...seems like a no brainer to me.
Lastly, location is good - it's close to the Peel station on the green line and within walking distance to nightlife @ Crescent Street & Sainte Catherine Ouest. The nearby restaurants however are relatively expensive and not as highly regarded in the Yelp community as I found out through my research.