When saying it is 'kind of you' you are saying that what someone has done or said was very appreciated or welcomed.
当说'kind of you'的时候，你是说某人所做的或所说的都很感激或受欢迎的。

Here are some examples: 这里有一些例子：

"It's very kind of you to offer me the job." 

你给我这份工作真是太好了。

"It's very kind of you to listen to me." 

你听我说真是太好了。

"It's very kind of you to join me." 

你能加入我真是太好了。

"It's very kind of you to invite us." 

你能邀请我们真是太好了。

"It's very kind of you to inform us what happened." 

你把发生的事情告诉我们真是太好了。

"It is kind of you to help us." 

你能帮助我们真是太好了。

"It is kind of you to fill me in." 

你能把我考虑进去真是太好了。

"It is kind of you to entertain us." 

你能招待我们真是太好了。

"It is kind of you to double my salary." 

你能给我双倍的薪水真是太好了。

"It is kind of you to decorate for the party." 

你能为这个晚会装饰真是太好了。