It's a quality that figures into his choice to sign on for 26 episodes of what is essentially a TV series that will be streamed online rather than, say, a feature film.
Still, a schedule that will require him to live in Baltimore six months at a time for the filming of each 13 is a big lifestyle commitment. But he says the end of his term at the Old Vic offers an opportunity.
"It seemed like a perfectly good time to accept a job that is a lengthy one that offered me a fantastic part and gave me a chance to work with a director I have admired," he says.
He also says he likes the city to which he will be returning this spring.
"I think Baltimore has gotten a bad rap. A lot of people talk about Baltimore and they talk about 'The Wire' and they talk about the violence," he says. "It's like, 'Hey, hey, hey, you've obviously been there for a weekend.' Or, 'You only watched "The Wire."' I've really actually gotten to know Baltimore, because I wasn't in and out. I was there for six months."
He's also spent time in Washington and Annapolis, where he's been spotted at Navy games and at restaurants.
"But I really enjoy being in Baltimore, and I'm glad we're calling it home. It's a vibrant, exciting city. You look at what happened on the waterfront. … It worked," he says. "There are so many incredible things going on there … the great diners, the great music places, a couple of really awesome bookstores …"
And now, Kevin Spacey bringing a little star power to old Mount Vernon on a sweltering summer's night.