We stayed at Le Meridien in March 2010. We had a fantastic stay but it was pre-children
What we liked best about it was that it has it's own private beach and a huge swimming pool. We were glad we never had to go to the overcrowded beach in Patong.
The main downside is that you need to catch a taxi to either Patong on Karon. MUCH too far to walk!
I can't tell you what kid's facilities were like as that was not relevant to us at the time.