Italy Suggestions

I am going to be travelling to Italy this summer with my husband and 3 daughters, 7, 9 and 10. We will spend 3 nights in Rome, 7 in Tuscany and 3 on the Italian Riveriera. We are having a tough time finding accomodations in Rome and on the Italian Riveriera for the 5 of us (most rooms do not accomodate 5 and adjoining rooms are not common). Any suggested places to stay? Any suggestions for places to go, things to do, things not to do, etc.??