Hi my cousin is looking for a three bedroom apartment in the Kata Beach area, ( June/ July and no he didn't give me a budget) looks like if you have to ask you can't afford it. Have done some research but if anyone knows somewhere close to the beach I'd be happy for the advice.
He, partner, 9 and 12 year old and a new one any time soon.
See below for what I've found.
http://www.katarocks.com/ Fantastic position
Kata Beach Vacation Rentals link is from trip advisor
http://www.phuketvilla-elisabeth.com/ is just behind the rocks and has a great restaurant called Bella Vista been in here once can't remember how many rooms.