I'd book Erhard's place as soon as possible if you are still considering. I had a great stay at his flat, which is literally right across the street from the Paulaner brewhouse (4 minute walk to metro, 20 minute walk to central Munich). I don't think the pictures do justice to the room - it is very spacious for a comfortable stay. Erhard is very friendly and a great host, and it was a pleasure to speak with him for a bit. Definitely recommend staying here!