I was researching a family reunion trip to Italy last year and used Ciao Bambino, an online guide to family-friendly accommodations around the world.  I was trying to find the "perfect" accommodations for everyone with ages ranging from 3 to 80 - quite challenging. Besides the great accommodation options with age-appropriate ratings,  I loved this site because it was easy to use, I did not have to wade through alot of information to find what I wanted.  While the trip ultimately did not happen, the site is a great resource for family vacations and they are adding more US and North America lodging which is perfect for us right now.  The site is www.ciaobambino.com.