The location is excellent, a 20 minute stroll to old port and lots restaurants closer by.
The Sonder experience is closer to hotel than a home. The apartment itself is brand new and very modern with all the amenities. The AC is excellent on a hot Montreal day. The pantry is pretty bare however, so be prepared to stock it with all the essentials if you plan on cooking anything.
We were travelling with an infant and Sonder was very accommodating with a high chair and crib.
The main issue with our stay was the fact that the apartment building is still very much under construction, which is not mentioned in the listing at all. We paid a premium for a comfortable stay, and we feel the value was eroded due to construction noise, sometimes literally banging on the unit balcony putting up exterior finishes. Was not a nice wake up call for the baby...
There were also deficiencies within the unit that you would expect with a new build, however the major one was missing baseboard and construction debris found by my crawling infant. A potential hazard that we raised to Sonder, but received no response.