20 year old girl, looking for accommodation in Amsterdam

I am a very simple person, and I am a twenty-year-old female that loves to bike and work hard, I am from Dutch and German descent, that spends her time studying, working out and occasionally working in an office organizing tours. I am friendly, openminded and organized. I would like to have an accommodation to live in with a heating system, a shower, and a kitchen. I study communication science and spent most of my time in the library, so I would like a safe and secure place to stay at night.