To set your location, go to theme root directory, open js folder, find script.js edit it with text editor (like Notepad++). Change the latitude and longitude. First one is latitude and second one is longitude. To find your locations latitude and longitude, click here
jQuery Code
center: new google.maps.LatLng(40.6700, -73.9400), // New York
If you want to change styles of the google map check this site