Using GeoCoding Google API
As said in the Extension settings, it's really important to use your own API key, so you're independent.
Once the Map extension enabled please click on "Settings" (unyson page in your dashboard). You'll see a text field for this key.
Please go to -> https://code.google.com/apis/console/
Create a new project (name it as you like it doesn't matter). Click on :
Once enabled, click on "Credentials" (in the left sidebar).
You'll have the possibility to create a public key :
In the next screen you'll see your "Public API Key", please copy past in the extension settings.