Find a nice decent hotel near to plaza and hire a car is a must if you want to explore the city. Bus or taxi are NOT recommended Mid Summer will be perfect weather to stay here
Costa mesa has lots of things to do with, form the big plaza to go hiking. Make sure it is summer, wear layers, and rent a car there !
Close to all costal restaurants and beaches, close to LA, UC Irvine, and everything is accessible right off any of the major freeways.
Many shopping malls and retail centers right off the major freeways, the climate is perfect most of the year. Can get to Costa Mesa quickly from LA to San Diego. Its in between everywhere and very, very clean and well organized.
Costa Mesa is a great central location in Orange County to use as a hub to visit other parts of Southern California.
It's close to SNA airport, major freeways, two enormous shopping centers, Disneyland and beaches.