one month rental needed for our Foreign Service son and family in March – any snowbirds out there?

My son and family are in the Foreign Service and have lived in Nairobi for 4 years. They want to spend a month in Pittsburgh to visit us, their parents, before moving on to their new post in Jordan. They have 4 year old twins- are looking to rent a kid friendly 2 bedroom house or apartment for March. Any ideas or leads would be greatly appreciated. Thanks for your help. Melissa Jones