When in doubt - if you can - say no. I'm a mom going thru a nanny change and I try my hardest to make sure they know the focus is the kids not my home. If you are bored during naps and want to tidy up, sure - that's great and makes my life easier which in turns mean I am happier come bonus time. But I wouldn't turn the job into housekeeping for a nanny. Good nannies have skills I need for that task.