The 'free' membership is absolutely free.
It allows you to register, discover the Workero locations, build your hero network by connecting with them. Once connected, you can exchange and chat with them, why not meet @ a Workero location? Need a work space for an hour? A week? A few months? No worries, book and pay just what you need, no more.
If you have a consistent need to fill in terms of workspace (fix amount of days per months, fixed location, or several locations) a paid membership is probably what fits you best.
If you are booking space in your mission as employee, your employer can set up a business account and enjoy central billing. Regardless whether you require a py-as-you-go solution or a membership.