The more «votes» a page gets, and the more votes from high quality sites, the better a page will rank for its keywords. (clicknewz.com)
For link building, the ideal link is going to be a link from a site that is as close as possible to the most authoritative and high quality site in that niche. (searchenginejournal.com)
This often means listing your rental unit on as many high quality sites as possible. (rentalutions.com)