Also, please make it clear what you plan on having the kids doing. If they’ll be sleeping or watching TV or something low-maintenance, let us know if we can use the time to study- Idunno about other people, but I wouldn’t unless I knew it was okay, and I’ve given up some of the few babysitting jobs I’ve been offered because they conflicted with studying. If, however, we do have time to study, we’ll thank you on bended knee.
In general, though, let us know beforehand what level of maintenance you need- and pay accordingly.