Well usually this is an easy question for me to answer. I never tell people to pay off their mortgages for rentals, but we have 4% interest rates, not 11%. 11%, wow... Banking on rent appreciation is dangerous what if you don't get it? How long do you want to feed this property? Your deal sounds a lot like what got people into trouble here in the states a few years back, feeding the property banking on appreciation, then the economy tanks, they lose their job, get sick or divorced, bye bye property and whatever money they had invested in it.
If you are set on keeping the property, yes, pay it off. Maybe rates will drop in the future, if they do, take a cashout refi to get some of your money back.