Also:
How much time do they spend during their visit?
Do they administer medications if necessary?
Weather---what happens if there is a storm or something...do they come?
Do they require 2 house keys (in case one person should not be able to make it for some reason...is ther a back up available? We had to turn over 2 keys to ensure that someone would be there no matter what...medical emergency, weather emergency, etc.)
what is their procedure if there is an emergency? We provided our vet information and they are allowed to use their own judgment to take our pet to the vet if an emergency arises, calling us if possible, and we reimburse.
Our requested a LOT of details, which was comforting, about their personalities, their afternoon potty habits, do they need to be fed, watered, what products to use to clean up if there is an accident, where to place dirty towels, etc, any allergies, which treats can they give (after we said that they could give treats), where to play, where to potty, etc. We also instructed to give each a kong from the freezer when they go back in their houses.