Jetty's flat was great -- everything I needed for my short holiday. The room was *very* big, everything was super clean, and I had no trouble checking in or out. The flat could not be in a better location, right on the lovely Kollwitzplatz. There is a lovely market there every Saturday which is not to miss (surprisingly, despite the crowds, you cannot hear any noise from the flat). Jetty was very friendly and helpful. I will definitely try to stay there next time I am in Berlin.