Stayed here while in Montreal on business. The hotel is centrally located downtown and within walking distance to the business district as well as many restaurants and shops. This was critical for this trip, and St. Martin served this purpose well.
The hotel is fairly modern and very clean. The room was larger than average and the beds were very comfortable. The bathroom was extremely nice and the shower was one of those see through walls that can be viewed from the bed.
The only complaint I have is that the walls were very thin. There was a point in the night where I could hear every word of conversation from the people next door. I was on the brink of complaining, but managed to fall asleep as I had a long day coming up.
Overall, this was a really nice hotel and I had a great stay, minus the noise through the walls. The location is a huge draw and should definitely be considered for anyone who needs to be in the downtown area.