I've landed in Berlin with no accommodation arrangements while having to prepare a slideshow for a talk I was about to give the day after.
Within an hour Maya let me into the apartment to place my luggage. She recommended an excellent cafe not far from her home while she would prepare the room. The cafe was excellent, it answered all my needs and I returned in the evening to a comfortable room, stable WiFi and a warm shower.
Maya is an extremely pleasant host, The apartment is situated close to numerous restaurants and cafe's as well as a nearby train station.
I would definitely recommend staying there.