We got our petsitter through our vet. She is a tech there and does petsitting on the side. Since she works at the vet, we trusted her completely to show up and do what she was suppose to. The best part is she was already familiar with the cats, knew how to administer medication, knew where to take them in case of an emergency, and an added bonus...she sat there one evening and trimmed all their claws!!! She would either come twice a day, or stay at the house the whole time. We opted for her just staying there. It worked for her since the vet is just a couple miles down the road so close to work. If ever looking for a petsitter I recommend checking with your vet first. Here's a really good checklist:

http://www.kindplanet.org/petsitterlist.html

Having so many cats we also printed a picture of each cat with their name and a brief description about them!