Tucked away down a cobbled alley behind Russell Square Station, The Horse Hospital, a converted stable, is a unique and totally independent arts space specialising in underground and experimental media. The gallery space itself (known as The Chamber of Pop Culture) houses unusual exhibitions, film screenings and other events.
On a hot day there is nothing better to do in London then go for a swim in the Heath ponds. You get completely transported you out of the city as Hampstead feels like being in the countryside except you're in central London?!
It's really close to my house and one of my favourite pubs in London! (I even went before it was close to where I lived!) It is London's first cooperatively owned pubs and has lovely events and workshops, exercise classes and great parties, and good beer! It's lovely in the beer garden in the hot summer and equally great in the winter, next to a real fire.