Publishing listings is 100% free throughout the website. Paid listings may also be avialable, if so you will see an Upgrade Button on your listing

No. Your email address is not visible on the website.

In general, a listing is automatically deactivated after 6 months. You’ll receive an email one week before deactivation and another on the day it’s deactivated. You can reactivate it within the following month by logging into your account. After that period, the listing is removed permanently.

Once your item is sold (or rented/leased), log in to your account and remove your listing.