
Originally Posted by
HBP C3, emphasis added
"Yes," said Dumbledore. He did not ask Harry why he had not confided in the Dursleys. "Our problem," he continued to Harry, as if there had been no interruption, "is that Sirius also left you number twelve, Grimmauld Place."
"He's been left a house?" said Uncle Vernon greedily, his small eyes narrowing, but nobody answered him.
"You can keep using it as headquarters," said Harry. "I don't care. You
can have it, I don't really want it." Harry never wanted to set foot in number
twelve, Grimmauld Place again if he could help it. He thought he would be
haunted forever by the memory of Sirius prowling its dark musty rooms
alone, imprisoned within the place he had wanted so desperately to leave.