From their FAQ (http://support.roomster.com/hc/en-us/articles/200763754-Deleting-your-account)
Need to have your profile and listings removed from our database? Not a problem. Use the Delete Button and you will be completely deleted from Roomster.
Thanks to Max at Roomster, who called us from NYC to inform us.
URLS:
http://roomster.com
https://www.roomster.com/Settings/DeleteAccount