Is there anything to do in Gerde's bedroom?

Hint 1 of 8:

And what exactly are you doing in Gerde's bedroom anyway?

Hint 2 of 8:

Don't you feel guilty for snooping through someone else's things?

Hint 3 of 8:

Of course you don't !

Hint 4 of 8:

There really isn't much to do in the bedroom, other than look at Wolfgang's
picture.

Hint 5 of 8:

Did you examine her closet on the way out?

Hint 6 of 8:

That might be the ideal spot to hide a key.

Hint 7 of 8:

Can't spot it?