Visit Craigslist.com and select the appropriate state and city. On the first page, find the heading, Housing and select the link Rooms/Shared. This link leads to a full page of Rooms for Rent and Shares Available listings.
A search bar at the top of the page lets you enter general search information, and an advanced search option on the left side of the page lets you select from a variety of options including Private Room, Dogs or Cats OK, No Smoking and Minimum and Maximum Price. Below the search box is an extensive list of links from potential renters. Each link offers a simple headline such as "Spacious room for rent," or "Last room in my lovely apartment."
To begin a search, select from the options on the left side of the page, add specific keywords in the search box, and click on the Search button. Once you find an ad that interests you, click on the Reply button at the top/left of the page to see a drop-down menu of ways to contact the renter that may include Yahoo Mail, Gmail, and Hotmail. The email that you send contains only your Craigslist email address, so as to protect your privacy.