Where can you stay for cheap in Helsinki?

I am interested in founding out one information. Where can you stay for cheap in Helsinki? I am going there next month. I wouldn't like to spend much money on accommodation, because I want to have enough money for night parties and going out. Any advice is very welcomed. Thank you in advance.

Are you sure that every advice is very welcomed? If I understand you want to spend all your money in going out, but you want to save money for accommodation. That is very stupid thing to do. So I will suggest you more stupid thing. You have the cheapest accommodation on a bench in the park. It is even free (if policeman there doesn't catch you). And one more good thing is that you will enjoy nature there and you will have the great view. Accommodation is one thing that you mustn't save money for. It is very important that you have good accommodation, when you are in foreign country.