Kirsten was a great host. She sent all the info about the flat and keys early on. She was flexible and it was easy to arrange for my friend to pick up the keys. The flat is in an ideal location. There is a brilliant market round the corner and it's very close to the metro. The flat itself was very spacious and had a lovely balcony to enjoy the sun :)
It was very clean and had all the amendities we needed. We'll definitely stay there again next time we visit Berlin.