Get more for your money by staying just outside of the centre of Amsterdam. With a tramstop just metres up the road you will be able to jump on and jump off in exactly the area you want to be whether that be the red light district to see what the all the fuss is about or Leidseplein to discover the bars and clubs.
Most rooms are based on 6 people in bunk beds and are en-suite so you won't be sharing facilities with other groups.