Configure this is as easy as open the maps.google.com page in your browser and copy some values.
First of all you need to search the address you want in Google Maps, once you found your address you want, you only need to copye the next values as shown in this picture.
Default Address Street: Just copy the address in the search box.
Default Address Latitude: Copy the first number after the '@' in the URL.
Default Address Longitude: Copy the number after the ',' of the latitude.
Remember to rebuild your website and apps, and that's all, now you can set the default address to your website and apps.
Glad we can help.
Regards, Pol Zepeda