Oh, this was such a refreshing read--refreshing indeed as a gillywater with a dash of sherry!
I do love a Minerva grumbling over administrativa, and an Albus totally overlooking some of the details (something your Albus shares with the Albus in The Reluctant Phoenix, actually).
And Rosmerta is just the right sort. Clever and wry, and willing to be caught out by a discerning witch.