Came here for the lunch hour power/ashtanga class on a recent trip to Montreal. Overall, this is a solid studio. Great location on St. Laurent, just a block away from Schwartz's in cause you need some post-yoga food! (My preference though was the healthier and quieter SoupeSoup on Duluth). There is also a spa, but I just went for the yoga class.
The studio is nice and airy. I would say the building is a bit old and it's not the cleanest facility I've seen, but it was okay. I like that they provided jugs of water and cups in case you forget your water bottle. I also like that they allow you to store your yoga mat in the changeroom. If I lived in Montreal, it would be much more convenient to just leave my mat in the studio instead of lugging it back and forth between home/work/yoga. The change room is pretty small though, and given that the lunch class was quite busy, it was a bit crammed.
The class itself was really enjoyable. The teacher was Jacob Cino and he was very helpful, positive, and made us sweat a lot in the shorter 1 hour class. He conducts his class in a mix of English and French.