Here you go... photos of the one toilet shared by the lounges including the Air France lounge used by Qatar Airways at Charles de Gaulle, terminal 1, Paris.

The Star Alliance lounge is far far far superior, except there's almost no food. I recommend you buy something in the terminal and take it up there.

the only toilet in the men's room


the floor of that toilet


something someone had written on the wall, amongst many other graffiti. It says "this is a ...... 1st class lounge". And they're not wrong.