Can anybody recomend a good cheap hotel for 4 lads to stay in Amsterdam in early october?

here r some hotels with reviews in which u can according your choice
http://www.google.com/custom?hl=en&client=google-coop&cof=AH%3Aleft%3BS%3Ahttp%3A%2F%2Fwww.google.c om%2Fcoop%2Fcse%3Fcx%3D000839534502583324404%3Ax7x pntksphm%3BCX%3AHotels%2520Search%2520Engine%3BL%3 Ahttp%3A%2F%2Fwww.hotelsempati.com%2Fimages%2Fhote l-view.jpg%3BLH%3A100%3BLP%3A1%3BVLC%3A%23551a8b%3BG FNT%3A%23666666%3BDIV%3A%23cccccc%3B&adkw=AELymgW6 R5WbGfde3q1GdKwwzAKLMqBM8jnJlSDvMpaLPRfwff_MUAiq33 tpJ9B1QDE5WZ1YS7-02l14_ByI0Aic7fRFjPGUZejgnOuu-mMc_imzk4HzKBg&q=good+cheap+hotel+++Amsterdam&btnG =Search&cx=000839534502583324404%3Ax7xpntksphm

You can filter your options using price , star rating , maps and descriptions here:

Amsterdam : http://www.cheaperthanhotels.co.uk/Netherlands/Amsterdam/
City Center : http://www.cheaperthanhotels.co.uk/Netherlands/Amsterdam/City-Centre/
Dam Square : http://www.cheaperthanhotels.co.uk/Netherlands/Amsterdam/City-Dam-Square/

Have a look around at the various areas as location is likely to be your main issue