Our stay at the Sonder was fantastic for those who want DIY check-in/out experience. Definitely an awesome location with restaurants, coffee shops, grocers and more surrounding you. Buvette Pastek is a nice wine bar that also acts as your lobby directly below!
The train is a brief hike, but the bus stops are everywhere and public transit in Montreal is robust and affordable.
The room was small but immaculate with lovely windows that look into the street below. Weekend noise will last longer into the night, but the room provides a sound machine if you would like to use it. We did not find the nightlife troublesome, but light sleepers should be aware.
The only thing is that the hotel does not have on-site luggage storage for after your checkout, but they will link you to nearby storage locations/lockers that you can rent. You can opt for late check-out too, but know ahead of time as it is based on availability.
Overall, the stay was excellent for anyone who wants an upscale room to wake-up and sleep in while they explore Montreal.