Last year we had a guy from Africa who stayed with us. I learnt a lot from him, got inspiration from him and when we went out it was hilarious and fun. We are still really good friends. He did however seem to sleep at different times to the rest of us. For instance, he would get up at about 4 or 5 am to do work! He sometimes used to make calls early in the morning, and when he spoke he spoke quite loudly and sometimes it seemed like shouting! It was interesting in a way to learn about the culture though.
I also had a friend who moved accommodation because he claimed Indians were quite loud, playing their music etc.