Hi phdraider,
I am not doing a PhD in Delft, in fact currently I live in Germany.
I do know that Delft is a very good place to study and one of the best places in the Netherlands, if not the best.
Unfortunately, as you indicate it is very expensive, especially regarding the housing! Yet this area is very much in demand, hence that it will be unlikely that you will get a major increase in salary.
No easy solution, I am afraid.