Swedish student looking for housing this spring

As part of my Computer Engineering degree in Stockholm, I'll do my master thesis at SAP this spring. Therefore, I'm looking for a flatshare in Heidelberg with good connections to Walldorf with S-bahn or so.

I'm quite social person, and love exploring. As I was on a one-year exchange in the US last year, I shared a flat with two other people, and felt that I learned quite a lot in how to meet roommates expectations. During the weekdays I'll mostly be in office. In the evenings and weekends, I hope to explore the Heidelberg life and its surroundings.

As for now, I mostly know English and Swedish. But I'm studying German quite actively and can understand it relatively well. The rental dates are flexible, and I can stay at a hotel/hostel if the dates doesn't fit perfectly.