Three things lay on the doormat: a postcard from Uncle Vernon's sister Marge, who was vacationing on the Isle of Wight, a brown envelope that looked like a bill, and -- a letter for Harry.
Harry picked it up and stared at it, his heart twanging like a giant elastic band. No one, ever, in his whole life, had written to him. Who would? He had no friends, no other relatives -- he didn't belong to the library, so he'd never even got rude notes asking for books back. Yet here it was, a letter, addressed so plainly there could be no mistake:
Mr. H. Potter
The Cupboard under the Stairs
4 Privet Drive
complaining or whining persistently and in a peevish or irritating way
Rowling named the town where the Dursleys lived Little Whinging, because she thought it sounded "appropriately parochial and sniffy" (Pm).