I use pet sitter for my cats back when I was working, as I traveled a lot. I provided the cat litter, NOT her, so I expect that would be the same for small mammals.

She came to my house; it cost more for me to board them at her house! And she was set up for it, she had the kennels. I wanted my cats to be ree roain at home same as when I was there. Not sure how this would translate for small mammals.

She insisted on coming over and meeting the pets, gathering all the needed info before she would agree to sit for someone. Proof of vaccines, spay / neuter. Who is the vet in case something happens? Signed agreement that I would pay the vet, not her. What food did I use and where did I keep it? Where did I dispose of used litter? (See lots of this will apply if you go to their house).

Cats are very particular about their litter. Are small mammals? I don't know, but think about that too.

Some people will not use tap water, has to be spring water.

For small mammals, I think you would want to know if they are allowed out, and where. Even if they are at your home, some folks only allow them out in a bathtub (I have a friend like this; but her cage is enormous!)

Just some ideas to ponder.