Write the exact network name and password on separate lines, preserving capitals, numbers and symbols. If several networks are visible, specify the guest network. Guests shouldn’t have to choose between details printed on the router and an old password in the welcome message.
Test the details at the property on a device before sharing them. When the password changes, update the guide, saved messages and assistant information. For multiple homes, check each one individually: accurate details for the wrong property still won’t help.