Does Katia's laugh grate on you.
 

does me.
kya kya kya

like she does it as a nervous reaction.

I think she's getting treated a bit mean by the other Housemates and some of them (older women!) are jelous of her youth. But just her laugh would drive me nuts if i had to share a house with her.

kya kya kya kya kya kya

i wonder what noises she makes in the sack