My sister and I stayed at Monika's apartment on 13-17.12.2016. We came to Berlin for some good time and the location couldn't have been better. Just a few minutes walk from Alexanderplatz, where you have some major shopping centers, restaurants and by far the best christmas market we've seen in Berlin (and we went to quite a few). All the public transportation (buses, tram, underground and train) are right there so if you're comming from Schoenefeld airport there is no need for a taxi. Monica is lovely! She met us there upon our arrival and made us feel most welcome. The apartment was very clean, cosy and well heated. It had everything to make our stay there enjoyable.
I highly recomend this place.