I have been to some pretty spectacular events at Augusta House in the past. They have the ability to book some of the best DJs in the city, and they were also host to a legendary charity event for the Philippines last year -- hundreds of people rammed outside trying to get in.
The venue is very spacious. I think it holds well over 200 people comfortably. There's a nice sized danced floor right in front of the DJ booth with some pretty cool disco lights. Sound system is not the greatest and gets drowned out heavily the more packed/loud the place is, but with all the noise complaints in Kensington it's sort of hard to avoid.
The drinks are dead cheap. They have lots of drink specials before midnight so if you like to pound back 3 dollar shots and such then you might want to get there early for an event. The men's washroom is very small and cramped though. If you were to get 4-5 dudes in there at once it could get very uncomfortable.
The staff has always been super nice to me. If you can hit this place on the right night it really is a wonderful time. Lots of places to sit down and relax if you're not the dancing type. Even a pool table at the back if you really have no interest in the performances. Oh, and they only take cash at the bar so come prepared, though they have an ATM on site as well.