And don't worry too much. As the weeks pass, the frustration level will go down, and you may hear from your student less often. During the last few weeks, students feel the pressure of completing their program as well as the realization that their time is running short. They will want to see and do all they can, and communication may dwindle. Even if you make regular phone calls, send mail.
Students appreciate as much word from home as they can get.
Ask your student to send postcards and letters describing outings and daily life, and follow his or her experiences with the maps and travel guides. Ask your student to draw you a floor plan or send a photo of his or her living space. You will feel better if you can picture your student in this new setting. If your student is in a very different culture, it may be hard for him or her to describe things to you. Try to think of ways to suggest topics.