Comfortable and very clean place in the top-notch location, very close to beautiful pedestrian streets and metro station.
As you might expect, streets could get noisy in the night so if you're a cautious sleeper earplugs are recommended.
Common areas are decently clean and bathrooms are completely private, which is a great advantage.
Check in process is easy with the instruction provided and shouldn't really take longer than 5 minutes.
Overall I would consider Le Sand and Stone the next time I'm in Montreal, really good value for the money.