I've used the "got junk" guys and they are good. They watched out for my walls and other valuables when getting rid of my junk from my house. I also used another company to deliver a dumpster and then pick it up 4 days later. The latter was 100 bucks cheaper. But if you don't want to do the work yourself then Got Junk is the best way to go.
I rented a dumpster about 10yrs ago when I renovated my basement but can't recall the company. I'm going to need one next spring when I tear down and rebuild my tool/garden shed... and toss out way too much junk that's in my basement and office!! ACK!
There are many junk removal companies in the GTA. You can Google it or even look at the yellow pages. Got Junk is the best because they do have the best customer service, however are also the most expensive. They are proven quality. So I recommend them.