The University and Unipol have family accommodation available. You can apply for University accommodation here and Unipol family accommodation here. Sometimes a waiting list, so best to apply as early as you can.
You can also look in the private sector but this could be a lot more expensive.
You may need some temporary accommodation while you look for something to suit your family. Try a Bed and Breakfast or hotel that is close to the University. The University Accommodation Office also have temporary accommodation every summer here. Although make sure not to sign a contract for longer than you need or you will be responsible for paying rents in two properties.
If you have problems finding something suitable have a chat with LUU Advice.