I am very happy to receive your letter and glad to hear that you will come to my city and stay with us for a few weeks.

我很开心收到你的来信，听到你将要来我这里和我待几周我很高兴。

youdao

Alone, late at night I am still one person, not for whom the stay, but waiting for you.

独处，深夜我依旧一人，不是为谁而逗留，而是为你而守候。

youdao

I am calling to thank you for all your help during my stay here.

我打电话来是向你道谢的，承蒙在我逗留期间对我的招待和帮助。

youdao

Of course, these will depend upon your actual usage but if you are like me, I need to stay in contact especially when I am gone for a few weeks.

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