Thanks a million. I really appreciate it.
I really appreciate what you’ve done for me these days.
It’s very kind of you to help me.
I really don’t know what I would have done without your help.
Thank you for one of the most enjoyable visits we have had in many months.
Thank you for contributing so much to the pleasure of our staying.
Thank you so much for your generous hospitality.
You must give me the chance to return your kindness when you visit here.
Thank you very much (ever so much) (most sincerely) (indeed)(from the bottom of my heart).
Thanks a million (ever so much).
It's generous of you to take so much interest in my work( to give me so much of your time) (to show me so much consideration).
I want to thank you for your kindness to me and for your compliments.