This is the ID used within the Vagrantfile. It is only used for your internal identification.
The hostname the machine should have. This answer lists all valid characters.
Name your Google Compute Engine instance as it will appear in the Developer Console.
Choose the one closest to you, or your target audience!
Pricing information. Google Compute Engine charges by the hour, but also shows what a full month would cost.
Tags for this machine. Comma-separated.