Oh, God! This is gonna be a fun read!
I especially liked the "everyone runs around him like chickens who have somehow misplaced their heads" comment, as you've made it sound so much funnier than the original, boring old saying.
What a darling first chapter! I love Ginny's grumbling, narrative style and her rye sense of humor. Her descriptions of the Delacour clan made me chuckle and her griping about bunking with three snorers had me grinning from ear to ear. You've got Ginny's voice down quite well and I'm really looking forward to the next chapter.
Poor Ginny! Three loud witches sharing her tiny little room. That would make me write in a diary again too. Then she's not even able to wear the knock-out dress to make the ex drool. That so sucks for her. I'm looking forward to the next chapter...wait, I think I'll read it now.