Harry says that Hogwarts would not be the same without Dumbledore. He also wants to finish the search for horcruxes to defeat Voldemort. However, he does return to Hogwarts at the end. If he did return he would be killed by Voldemort who was running the school.
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I think he was afraid the death eaters would be able to follow Kreacher and find Harry and the others.
Kreacher brought Mundungus to Grimmauld Place.
He inherits Number 12 Grimmauld Place, the house that the "Order of the Phoenix" uses as their headquarters and he also inherits the house elf Kreacher.
Knockturn Alley, Knight Bus, Knuts, Kreacher
Kreacher was originally Sirius Black's house-elf, but upon Sirius's death was granted via his master's will to Harry. He started off sour and mean, but after revealing that he witnessed his beloved master Regulus Black's sacrifice and being granted Regulus's old locket, he became much nicer. He led the house-elves to fight in the Battle of Hogwarts and fought using a kitchen knife. After the battle, Harry expressed the desire to have him bring him a sandwich, implying that Kreacher is now very loyal and warm toward him.
7 is a magical number in Harry Potter. There are 7 Harry Potter books. Also, wizards are considered adults when they are 17. Number 4 Private Drive is Harry's address for most of the books. 12 Grimmauld place is Harry's inherited house.