Nearly one million people will be staying at an Airbnb on any given night this summer, according to CEO Brian Chesky.

"Just tonight," he said Wednesday at Re/code's annual Code Conference in Rancho Palos Verdes, Calif., "more people are staying in Airbnbs than are staying in the city of Miami."

Chesky's seven-year-old startup, which was valued at $13 billion back in October, is growing very quickly. Airbnb is in 34,000 cities around the world, and more than 800,000 people will stay in an Airbnb every night this summer, up from just half a million now.

Airbnb's business allows people to rent out their homes and spare bedrooms to travelers around the world. Chesky says the company has had some notable successes lately — during the 2014 World Cup in Brazil, for instance. Chesky claimed that 20 percent of visitors to Brazil for the tournament stayed in an Airbnb, more than 120,000 people.

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Airbnb also just launched in Cuba in April with a thousand listings, a number that has since doubled. Of course, Cuba was a destination off limits to American tourists just six months ago, so it's a small market for Airbnb, but it goes to show that Airbnb is (quite literally) almost everywhere.

Where else is Chesky eyeing?

"Antarctica. The North Pole, we're working on. And we'll kind of move off of Earth from there," he joked.

Read MoreAirbnb is now bigger in Europe than US: Exec

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