Gert was extremely helpful and accommodating. My friend and I arrived at different times and he was able to help my friend get settled in safely. At the end of the trip we needed a 4am taxi and without cell phone service, Gert agreed to make the reservation for us. It was a big help! The apartment was perfect for our week exploring Berlin - very close to several metro stops that got us everywhere with just a few transfers. Gert also gave us a map that helped us navigate the entire trip.