This is a REALLY great story! I recall reading a fic once, where Harry comes on a shop called 'One Mann's Treasures' that had a private floo to the security entrance at Gringotts. Did you write that as well?
You've made Harry a mature and reasoning individual, not the nearly psychotic kid that most authors of 'Harry in Summer' use. He's angry, ys, but he's willing to listen. I think that's what makes the difference.
I liked the hourglass ward indicator. This story gives a good reason Harry has to stay and a method to monitor the wards. Harrry's contacting the Goblins will definately not go down well with Dumbledore, who seems to have forgotten the mortar when he began to assemble his house of stone. Ginny's mental difficullties are another sin to be laid at his feet.
Harry really ought to sue the hell out of the Prophet! Even in the 16-1800's, from which most of the canon (and often the non-canon) laws originate, allows for reparations in the case of defaming the noble character, etc, etc.
Harry having to act as head of house and negotiate for a match between Neville and Hannah, was priceless! Madam Longbottom will be desperately needed as Harry learns of his heritage, and the responsibilities that go with it.
Hermione is still the wild card. As an H/Hr shipper, I would love to see them together, but I know that not everybody agrees with me. Since I'm not President yet, I suppose I'll have to deal with it.
I loved the way you dealt with the problem of Mr. Weasley's letter. Harry is a Weasley in all but blood. Leaving them would be as bad as leaving Hermione.
I have placed this on my 'alerts' list and hope to read more soon. Alorkin