Housecleaning as a perk will improve not only the employee's
productivity but his/her family's quality of life.

When asked about Evernote's company culture
in a recent NY Times interview:

"Probably the thing that we do that people love the most, though, is housecleaning. If you work at Evernote, you get professional housecleaning twice a month.

We thought that we needed to get spouses and significant others on our side. I want the pressure from them to be, "You better not be thinking about leaving Evernote." I don't want the pressure to be, "Maybe you should think about going somewhere else?"