If you have an address line 2 (suite, floor, etc) you can easily add these details to your location by editing it within the web application. Unfortunately, these details cannot be added when using the Google Sheets integration at this time.
First, you need to make sure there is an address selected for your location. If there is an address selected, you will see a map preview of your location with a pin on it.
Once this address has been set, you can simply edit the full address in the text input. Then save your changes and it will save whatever additional address details you've added.