Dear Sir/Madam,
I am writing to tell you how very much I enjoyed the days at your school.
Everything was just about perfect. Your generous help and tender care made me feel warmly welcomed and transformed my short term study into a beautiful memory.
I hope you know how I appreciate your hospitality, and your many kindnesses to me. I count myself fortunate indeed to have this opportunity to study at your school.
With thanks again and best wishes to you.
Yours