Pros: Nestio is a great site for people who are looking to live with others. The site is more of a Craigslist supplement than an alternative, since it helps apartment seekers save and organize their listings from all over the web. The standout feature is the collaboration tool, which lets you invite others via Facebook or email to add to your apartment wish list. Nestio also plots your favorite listings on a map and calculates commute times to and from a custom location. The iPhone app is great as well, and the notes and photos you take from your mobile account are automatically synced with your account online.
Cons: The mobile app isn't available for Android users, but according to the site, support for additional devices is on its way. As mentioned, Nestio doesn't provide apartment listings, but it will accept URLS from Craigslist, Trulia, and eBay Classifieds, among others.