My boyfriend and I live in a gorgeous flat right in the centre of Berlin.
We're both medical students, and really love traveling.
We have had very nice experiences renting out our bedroom through Airbnb. Since we are currently away from Berlin on an internship, we have decided to now rent out our whole flat - it would be a shame to leave it empty! :-)
My little brother will take care of all the formalities, let you into the flat, give you tips, be your point of call if there are any problems etc.!