Private one-room apartment for international PhD student @LUH

I'm an electrical engineer looking for a place for my 6-month research assistantship in Leibniz University Hannover. My contract starts mid-December to later enroll as a PhD student. I will be studying intense German along with my studies in LUH. I have a certificate from university showing my status and my monthly allowance upon request.
I expect a private studio (private bathroom and kitchen) for myself alone. I do not drink or throw parties (not a fan!). The natural light is critical for me so I expect big windows (no basements sorry) and preferably a balcony/terrace. I love cooking so a relatively big kitchenette or a small kitchen would be ideal. Moreover, I do appreciate the location to be in 30-min max far from LUH by publication or even better bike-friendly to get to the university.
I am a native Persian-speaker with an international experience and passion for travel. I have lived and studied in Sweden and Belgium before (meaning I understand basic Swedish and Dutch) and Germany will be my third foreign home to explore!