My fiance (26) and I (23) are looking for a fully furnished one/two- room apartment for long-term rent

I have finished my studies in Psychology (BA) and am starting my masters studies in Neuroscience at the University of Bremen. I wiil be moving there together with my fiance who is searching for jobs as a 3D artist. We are looking for a one/two room apartment or a studio that is fully furnished (beacuse we are moving from Serbia which is quite far so transporting furniture is not an option), and costs approximately 650 euros per month (electricity and other bills included).