Robarts is a great library in the heart of the University of Toronto St George Campus. It's multi-level library has anything and every educational literature you could possibility want. A hotspot for studying and reading with university locales.
There are internet terminals you can use there. By now they must have Wifi access, I know that they do in the Arts and Science building. The library opens late hours, though I do believe that you need a student card to access certain parts of the library.