Ulf's place is a nice and professionally run abode in central Kreuzberg. The apartment is nicely furnished and has everything you need for a comfortable stay. Communication with Caroline was good and easy and the self check-in/check-out worked seamlessly. I can highly recommend Ulf's apartment. My only recommendation would be to maybe leave a few tea bags and a coffee pod or two to put the second "b" (for "breakfast") into Airbnb. :-)