There are two ways to give away household items on sites like Craigslist. You list it in the free section and, if it's not total junk, you'll get dozens of emails as soon as the ad goes live. Then, you quickly yank the ad so your inbox doesn't fill up, reply to the first email with your address and pickup instructions, and tell everyone else that the item is gone. After half a day you realize that first person is never going to show, so you tell the next person who emailed you that it's still available and move on down the list.
If you don't feel like spending the day writing emails and giving directions to your house you can just put up an ad with your address and say that you'll look out in your driveway (maybe) and if it's gone, take down the ad. But, then you make everyone drive all the way to your house just to see if the item is still available, plus you just put your home address in a Craigslist ad.
Instead of all that, you can just create a new listing on NoBenjam.in, then put a link to that in your Craigslist ad. NoBenjam.in will give the first person your pickup instructions and tell everyone else that the item is no longer available. If the item never gets picked up, you let NoBenjam.in know and the link will be re-activated. Plus, anyone who was interested before but turned away will get an email letting them know that the item has been made available again. It's pretty much exactly what you were doing before, but now _you_ don't have to do it.