For about 4 months I have had to endure my sister bringing home a 19 year old man who looks like what you'd call a Roma Gypsy or Sephardic Jew, I'm not quite sure what he is exactly...but I can tell you, he has one hell of a nose on him and he certainly isn't white! Well anyway, I'd like the advice of WN's on the matter, what you would do in this situation, and what would you say to your sister if you were me.
I would clear off out but renting places is so damn expensive in the UK.