For a traditional end stage configuration, all the rows in the floor section seating at Air Canada Centre will be classified by number, and from row 11 you will be just 10 rows from the front of the section.
The seats face the left side of the stage and will have very close and impressive views of the performance. Floor seats are often considered some of the best for a concert as they keep you very well aligned with the front of the stage (requiring less head turning to catch all the action) and you will be very close to all aspects of the show. The only concern with floor sections is the absence of stadium style seating (there will not be any change in height between seating rows), which puts the views at risk of being partially obstructed if you have a taller fan in the seat just in front of you.
Please take care however as some performers may have a custom stage and floor configuration which could put Floor Left Row 11 in a different location.