If you have no method for paying for your rent why are you there in the first place. I understand if prostitution is illegal, that would be like paying for your rent with drugs. In the case of the UK I believe prostitution is illegal and the landlords and , to a lesser extent, the renters should be punished.
I also disagree with the statement that Millennials have hard it the hardest. That is complete bollicks. Being poor hasn't changed and I have been poor, I have been comfortable and the only way that you change that is to work. Your job is shit and it doesn't pay enough to cover food let alone rent? Guess what? You go and find another way of making money. Another job, selling your shit, getting another person in the same situation as you to board. Whatever it takes. Still can't afford it? Go upskill yourself so you are worth more to society. Live in squalor for those 3-6 years. Come out a better person and valuable to society.