What does the author try to convey through his experiences in Ireland and Barcelona?

A．Life is peaceful and enjoyable.

B．Living abroad is a happy experience.

C．Staying with friends makes one feel at home.

D．Travelling abroad enriches one's life experience.

解析：C　考查细节理解。根据第三段尾句“In the middle of the countryside, away from our constantly changing lives, we were able to become like a little family again”可知，和朋友待在乡村的中心，远离不断变化的生活，作者找到了家的感觉；根据第四段尾句“It was different, but one thing stayed very much the same — I felt at home again and we felt like a family again”可知，作者和朋友们在一起，感觉又回到了家，感觉又像一家人了。据此可知，文章中提及作者和朋友在爱尔兰和巴塞罗那的经历旨在说明和朋友待在一起能让人找到家的感觉，故选C项。