To set your location, go to theme root directory, open js folder, find script.js edit it with text editor (like Notepad++). Go to line number 184 and 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
var myLatLng = new google.maps.LatLng(22.402789, 91.822156);
If you want to change styles of the google map check this site