I have been a regular user of Streetlife too, and am sad it is going. I signed up for Nextdoor but when I discovered it showed my name and address I deactivated the account immediately. On Streetlife I didn't use my real name, and they didn't display your address either!
There is an option to remove your house number, but the map on the site shows members houses in green and non members in red, so it is very easy to work out a members actual address without too much trouble.
Maybe they might bow to pressure eventually to give people the opportunity to be anonymous, until then I won't use it, sadly. There is too much opportunity for unscrupulous people to get information you would rather they didn't have - asking for a good kennels because you are going away for example - takes on a whole new significance when people know your address. I know members need to be "verified" but Nextdoor don't know if they are criminals or not!