So I've planned a short weekly summer trip to Marseille, because when I was the first time in france, the country was just mind-blowing.
Started looking for an appartment on https://www.airbnb.com/ and https://www.wimdu.com/. After searching for a while, I finally found a cheap room on Wimdu in Marseille, which is pretty close to the center.
Took the airplane from Berlin-Tegel to Frankfurt, after this Frankfurt to Marseille. Both flights with Lufthansa.