Part Time Nanny Needed for my Children

We are looking for some help watching the kids ages 3 and 4 between 2:30-4:30 p.m. a few days a week in our apartment. Playing with them, light meal prep (filling drinks, providing snacks), and keeping an eye on them while parents work upstairs. On occasion parents may be gone for a portion of that time. The kids enjoy coloring, playing, and reading. Mostly potty trained but may need some help. CPR certified preferred. No smokers. Okay with college or high school students.