In Beijing soon -- recs near hotel?

My son asked me to post this for him.
He is going to Beijing on business for 5 days at the end of this week.
They are staying at the Premier Tianan Rega Hotel which is right at Tianan Men Square.

I have found some of your other restaurant suggestions, but not being familiar with Beijing, not clear where any were located. Are there that you would recommend some that are near his hotel?

Also, he is on a budget so getting a taste of well-prepared Beijing food and "good value for money" are always the priority. And again places that are near where he is staying.

For other recommendations that you think are worth the taxi ride to get there, how expensive is taxi fare to other parts of the city and how much time is involved? (he is going with a native Chinese speaker -- though not someone who has been to Beijing before -- so directions to taxi driver and ordering should not be a problem).

thanks, Susan