Location is the main thing. This place is very well-located downtown Berlin. A few meters from a subway station, and short distance to Alexanderplatz, main center of connections. The area is surrounded by restaurants, stores, and at a walking distance from many points of attraction in the city.
Toni is a very responsive and attentive host. Arriving to Berlin the airline misplaced my luggage, I commented this to Toni, and she almost took over the communication with the airline. I appreciate a lot this, especially since I don't speak any German.
This place is recommended for a solo traveler or a couple. I stayed two weeks, and everything was flowless.