Anton was a great host, he was very helpful when I had questions, and provided me with a city map, which proved quite helpful.
The room is large and airy, and the apartment was perfectly located for my trip. There is literally a subway station outside the front door, and another stop (for a different line) a block down. I also walked to many places, Brandenburg gate was only about half an hour walking. A supermarket, pharmacy, and many restaurants are within the same block as well.
I had a great stay in Berlin, and this was the perfect spot to explore the city from.
Tip: There are a good number of stairs to get up to the apartment, so don't pack TOO heavy.