We had a lovely few days in Berlin and enjoyed staying at Katarina's, although it was further out of the city than we had anticipated! Katarina's husband met us when we arrived and showed us the apartment and there was no problem communicating with Katarina before we arrived. We got a taxi to the apartment from the airport, but had we known how to use the S-Bahn to get there then that would have been much cheaper and fairly straightforward! The S-bahn is 2minutes away which is very convinient, and takes about 25minutes to get into the city centre. The apartment itself was very clean, definitely a 2 person apartment, not 4! We missed having wifi, especially when planning what to do that day, but other than that the apartment was as expected.