How To Use Xfce4 Terminal 0.6.x As A Drop-Down Console (Guake-style)

Xfce4 Terminal has been updated recently, two new versions being released: 0.6.0 and 0.6.1, and many new features were added, including an option to use the terminal as a drop-down console, like Guake or Yakuake. But this new feature isn't available as an option in the Xfce4 Terminal preferences, so here's how to use it.