Hi there :)
Using Jan´s advice, I found some similar questions that may be helpful to you Jack:
Here is a basic search on the website "Wg-Gesucht" for a 1-bedroom apartment. You can make the search more specific by clicking "More Filters"
Most of the posts are in German but the basic information (price, location) is then in English. If you find something interesting here that has a description in German you would like translated, let me know!