We recommend this flat strongly. It is a great base from which to enjoy Montreal.
It is spacious, well laid out, and very modern and clean. The kitchen/dining area is great, as is the master bathroom. Having two bathrooms and bedrooms is great for a family. The interior of the building has been well maintained, and the original features look great. You feel instantly at home.
The location has many advantages. It is five minutes to the nearest Metro station and a 5-10 minute walk to useful shops on Sherbrooke Street. There are some excellent restaurants in the area and all the useful things one needs, such as large pharmacies, food shops, and takeaways. Keep on walking east, and you get to see more of Westmount, a very nice part of Montreal, and keep walking, and ultimately you hit the downtown core. If you have a car, or friends and family have a car and wish to visit, the location is easy to get to from Montreal's motorway system. Parking at the back is spacious; however, the alleyway to the parking is narrow, and you need a small to medium-sized car to get through. Street parking seems sparse, so, on-premise parking is a real benefit.
There is some traffic noise, particularly in the morning, and we are very sensitive to traffic noise. I would say more sensitive than most people. Marina provided us with a small, noisy fan which was perfect. The beds are comfortable, and we slept well.
Marina is a good host and normally responded to messages within 30 minutes.
Really it is all good, and you will enjoy your stay.