I stayed here for our trip to Montreal during the Canadian GP. At no one's fault but our own, we were late to getting room reservations and prices around the city had sky-rocketed. We found Cobalt with a few weeks to spare and they were charging a reasonable rate compared to the everything else.
The room was great. It wasn't huge, as expected, but it was clean and comfortable. There was even a small kitchenette complete with a burner, fridge and microwave.
The best part of this room is that it was in a great location. I was able to park my vehicle in the public parking across the street for $30 for the whole weekend. Cobalt is located steps away to Berri UQAM Metro station which is where multiple subway lines converge making accessibility to the race track, downtown, and other parts of the city very easy.
I would definitely stay here again on future visits.