This thrift store is pretty sketchy, but don't let that deter you because there are some great buys there.
So to describe the sketchy of this store... It's not the cleanest thrift store and it's pretty cluttered. The street outside the store is a little rough (the entrance to the store has a chain cage around it) but if you go during the day time, all the businesses are open and it's not too bad. There are some weird people that shop there, but that goes with most thrift stores, this one might have the highest population of strange people I've seen in Toronto...
That said! I found a GREAT pair of boots that were an expensive brand and almost new for $9. They have a ton of winter coats and a lot of housewares. I also have bought a bunch of books there before because they are pretty inexpensive and a good variety. They have weekly family specials ("All toys 50%!) as well as a lot of christmas stuff for the holidays.
Whatever treasure you end up buying here, I'm sure it's awesome! Just make sure you wash it first...