Babysitter Needed for my Children

We are looking for an occasional sitter for 2 young children(5m, 2. 5 yr) in Pittsburgh. Mostly this would be occasional weekdays when our usual childcare is closed and sick days. We would prefer someone who could help out with light housekeeping. We would prefer a nanny who has their own car, who does not smoke, who is comfortable with pets and who is CPR certified.