Pet Care Needed

I have three cats all between the ages of eight and 10 years old, all female. One cat does not use the litter box howevershe does use puppy pee pads on the floor in the basement where the litter is the other two use the litter box consistently. They get fed twice a day, I scoop the box once a day, and they have access to water and dry food all the time. because I will be gone for so long I do not want to leave them alone in the house and I would like somebody who is willing to housesit as well as take care of my animals.