what is the quality of life?

what is the quality of life?
I read the article about the pressure of mortgaging the house that be faced in the white-coller workers the other day,it said that you will be in trouble if 50% income have been used for pay for bank loan.giving a exemple,someone canceled all social activities for pay a debt,including have a good diner with friends every week and take part in physical exercises and so on,so experts gave a question for everyone,do you think that is a bad influence for your life?
anther real story,my friend have broken up with his girl friend,the reason is that his girl friend don't want to spend their lives together without a house owning them,but on the contrary,my friend is willing to rent a house for his whole life,the reason is simple,he don't become the slave of housing.he hope he has a good quality of life.
so we have to face the question:what is the quality of life?
I think it should be two aspects:spiritual world & the physical world.
if I must give up my interests,it's only for buying house,I think I will not do that.