My roomie has recently been applying for PhD programmes. He's particularly interested in the one led by prof X in Some University, so the other day he sent an email to prof X, presenting his research experiences and showing his interest in prof X's research, to which he got a very positive reply from prof X today:
Hi XXX, Yes I am planning to accept PhD students this year. I strongly encourage you to apply... please indicate theory as your interest and/or mention my name as faculty of interest in your application.
This sounds like great news. So my roomie decides to reply and tell X he's really enthusiastic about applying to this programme. But we neither have any idea what would be an appropriate way to do this. Would simply writing like "thanks for your help prof X I will definitely apply!" be too short and not show enough enthusiasm? Could anybody give some advice? Thanks!
First question asked on this site so if there's any inappropriateness please tell me.