Pittsburgh Post-Gazette, has a very interesting list of sites, specific subscription services that offer rental listings placed and paid for by property owners or managers.

In these very well categorizes web sites one can find (perhaps) the place(s) of his dreams.

Some of these sites are:

http://www.vrbo.com/
http://www.homeaway.com/
http://www.vacationhomerentals.com/
http://www.vacationrentals.com/
http://rentalo.com/

In these sites you will be able to read very good (or not) reviews on their services and properties provided. Also, you can find reviews on Vacation Rentals through this link http://vacationrentals.factexpert.com/ and better check this page for a complete listing of related categories : http://sitemap.factexpert.com/travel/