The following is the relevant conversation about Good from a radio interview with Vicente Amorim:

When will the film be shot?

We will start to film next March, in Berlin.

Why Viggo Mortensen?

Viggo Mortensen is an extraordinary actor. I had seen him in A History Of
Violence, directed by David Cronenberg, in which he plays a man haunted by
ghosts from his past. In Good he is a mirrored image of it, his character is
becoming the ghost he will be. He has the perfect biotype to play a German.
He has a sweet kind of masculinity, almost fragile and these characteristics
are very important to convince the audience about his choices, even though
these choices will take him to an abyss.

Aren't you scared to work with an actor like Viggo?

Of course, I'm scared. I'm anxious. I'm looking forward to it. I'd love to
start it right now. It's a unique opportunity to work with an actor like
him. All the fears I could feel disappeared when I met him some weeks ago
and he accepted to join us in this project. He is a very down-to-earth
person, not at all involved with the glamour of Hollywood. He is a very nice
guy.