Qué bueno que estés aquí.
The subjunctive in English expresses:
What is the subjunctive mood used for?
If they had known the truth, they would have been angry.
unlikely situations, hypothetical or doubts, wishes, advice and orders.
It's good that you're here.
Te pido que me escuches.
I would like us all to get together.
Me gustaría que nos juntemos todos.
allows you to show what your attitude is towards what you are saying
De haber sabido la verdad, que se hubieran enojado.
I ask you to listen to me.