Turn left at the roundabout into Victoria Avenue when coming from the direction of the shops along Windsor Ave. It's the funky white house with the décor - the palm trees and fountain. You can't miss it. On the weekends there would be cars parked all around dropping off kids and the such.
Or you can click here. Not sure if that's the exact house number, but that's where it is.
For public transport people, buses run along Windsor Ave and you can take that from near the train station or something. I know the 814 runs down there. Do your research.
If you're just there for the notes I'd suggest making an appearance near the end of semester to grab the whole set for one lesson's worth of moolah (it was twenty dollars or something). Though, it's easier (and costs less) to send a friend who goes there regularly to say they've lost their own set and need new ones.
Get there early if you want a decent seat. Sometimes when it's too full he won't let anymore people in. Also, if you can't stand repetitive jokes about his ex-girlfriends/penis molecules in chemistry, bring a plier or similar tools to tear your ears out.