Easy (Homejoy customer here). They show up at the scheduled time, say hello, clean, leave. I'm sure it's a personal relationship for some customers but wasn't for me.
this isnt that abnormal. i used to not see my cleaning lady for many months at a time. just left a $50 on the counter every wednesday on my way to work, came home to clean house, folded clothes, everything in its place... it was awesome.