The hill at Alexandra Palace gives you the view that Parliament Hill is always credited with but doesn't quite deliver. From the south terrace of the palace, with the city laid out below, you can see from Canary Wharf to the Shard to the distant smear of the North Downs. On a clear evening, with the light going orange behind you, it's better than anywhere else in London.
Muswell Hill is the residential neighbourhood at the top — Art Deco Broadway, good cafés, the feeling of a self-contained town on a hill. Come in the late afternoon, walk the park as the light fades, and take the overground back from Alexandra Palace station.