Dear Mr and Mrs Smith,
I'm writing to you in order to thank you for the warm welcome.I really enjoyed staying in your beautiful house.
I want to express gratitude for room and excellent food.Mrs Smith your chicken is the the most delicious meal i had ever eaten.Special thanks for your hospitality.I'm really gradful.
My english had improved a lot! Now its not a problem for me to live in an english speaking country.I still cant say speak english fluently but i not going to give up.
I want to invite your wonderful family to visit me.And i look forward to seeing you again.