I've been to Octopus Garden when it was in the Annex (where the current Ahimsa Yoga is) and loved the teachers. Finally got a chance to see the College West space and really liked it. Friendly staff oriented me to the place since it was my first time. I went to the Friday karma class, which was on the studio on the main floor (there is another studio upstairs). Each month the proceeds from the karma class go to a different charity. For March, it's the Alzheimer's Society of Canada -- a great organization.
The class was taught by 2 teachers who rotated (one at the front, the other walking around and correcting students). It was "all levels", and I found it relaxing although I would've liked it to be a bit more challenging. But that's the thing with all levels classes, it is hard to cater to people's different needs.
The studio is spacious and quiet. The Urban Herbivore makes for a relaxed meeting place pre or post-class, or a great place to pick up some vegan muffins to bring home!
I would come back, although it is a bit of a trek form the downtown core.