I think they meant working at a non-colleagues house. At least, that's what I plan to do when it's possible, every now and then. I think the change of pace would be nice, back at university I'd do the same with people not on my course. Being genuinely fond of each other makes time go faster.

Of course, I'd also want to work outside of the office, with my colleagues too. A change of environment every now and then can't hurt.