Please check to make sure that everything you left in the toilet has been flushed down.There were also instructions on how to turn off the water if the handle-jiggling didn't work.
If the toilet continues to run, jiggle the handle.
If you need a plunger, there is one beneath the sink. If you do not know how to work a plunger, call Steve.
Sure, I may have to replace my own toilet paper, clean out my own sink and deal with any plunging issues without Steve's assistance, but I will take some minimal bathroom maintenance over the necessity to post a sign reminding people to thoroughly flush the toilet any day.