This is a great place to stay! We actually ended up getting upgraded to a suite (next door at sainte-therese) for one night of our stay because of a booking error. Both the Saint-Vincet and Sainte-therese are very nice. You can't get a better location in Old Montreal. The rooms were clean and stylish.
We drove and parked our car next door at the hotel for the duration of our trip, which was convenient. So even though there is no parking on site that isn't an issue.
There was a little bit of noise from the street one morning, but it was not bad at all and earplugs were provided.
It was very easy to get in contact with staff, and they were always helpful and friendly. We would stay here again.