If you find yourself in Amsterdam, please stay at Matthjis's place. He's a great host, accomodating, and super quick with communication. The rooms are all upgraded, modern, comfy, and sparkly clean. You also couldn't get a better location. It's secluded enough down an alley, but close to Dam Square and all the yummy places to eat on Nes. If the red light district is your thing, you are really close to that action as well.