We absolutely LOVED our stay here! Great service from the front desk staff the minute we walked through the door to check in. The location is great -- right next to Rue Saint-Catherine with all the shopping and restaurants. We also ended up doing the Hop-on Hop-off bus tour, which has its pickup location at Dorchester Square, which is an extremely close walk from the hotel.
The rooms are beautiful with comfy beds, a fireplace, and gorgeous bathrooms. This is also a very small detail, but we appreciated the complimentary bottled waters provided in the room, which were replenished each day (don't you hate it when hotels charge $5 or more for bottled water?).
Would definitely recommend Le St-Martin to anyone looking for a nice boutique hotel experience in downtown Montreal.