=appreciate[感激/欣赏]

　　- eg: I'd like to appreciate ... ;

　　generosity[慷慨/宽容]

　　- eg: We were completely knocked out by their generosity.;

　　hospitality[款待/招待]

　　- eg: Many thanks for sb's hospitality.;

　　heartfelt[衷心的] - eg: sb's heartfelt thanks