Thank you!  Yes, Harry and Severus are both so uncertain right now.  Severus is really beginning to want things to be different, but isn't entirely sure how to admit that he was wrong and make amends, or if he even can do that, and Harry of course doesn't dare trust him yet. 

I'm glad you liked the new rooms.  I saw that as being kind of an important step for Severus.  Before, when he stuck Harry way up on the top floor all alone, he was trying to put as much distance between them as possible.  Giving Harry the suite of rooms next to him was a lot more than just giving him nicer rooms, or even more than being able to keep an eye on him.  It was really acknowledging that Harry belongs at Prince Hall now and is a part of his life, though Severus himself might not consciously realise that yet. 

And letting Harry write back to his friends was one more of those small things, that can really mean a lot.  It would have been a petty mean-ness to have refused Harry, and before Severus probably would have done just that, but now he can see that there's really no reason to deny Harry, and that it is one little thing he can do to try to make up for the past mistakes he's made.

Thanks again!