Filthy Guests

Is it just me or am I too fussy?

I had a guest staying in my house and they left the place in a disgusting state. Is this just bad luck? I don't know, but I do know if I am a guest in someone's house I would leave the place as I found it, it's not bloody difficult and the decent thing to do.

So why do I get the bad luck with people get here as guests?