We loved our stay at John and Kim's place and will definitely stay here again the next time we come to Montreal!
The location is perfect — you're within walking distance to great restaurants, shops, breweries, cafes, etc on saint laurent, old port, and core downtown. The studio is spacious, clean, and has all the amenities you need. The beds are comfortable (great pillows!) and you could easily fit 4 people. The A/C works great which is also a huge bonus. You access via key code vs a physical key which makes check-in and out so easy.
The hosts have provided a nice list of places they'd recommend for food, bars, etc (can confirm the theatre across the street has fantastic espresso!) which is also really helpful. You have delicious food within walking distance.
As the listing indicates, it can be a bit loud at night on the weekend with the bars nearby playing music. We had no issues sleeping at all. If you're a bit sensitive to sound, I'd recommend bringing earplugs/headphones and you shouldn't have any issues.
We will 100% stay here every time we come back to Montreal as it's the best value + location.