Dear Mrs Smith,
Thank you for your email.
It was unforgetable week in the USA with you and your family.
It was a holiday I have ever dreamed.
Your family is wonderful and very friendly.
I also want to thank you for your warm welcome, teaching me english and some phrases in spanish.
My time spent with you was incredible.
I would love to invite you and your family to my home in Kiev.
I would be happy to show you my city.
There are a lot of historical places, monuments and parks to visit.
I think we will have a good time here in Kiev.
I hope that you will accept it and we will meet soon.