Check out this incredible interactive map put together by the good folks at Trulia: it shows the median price per bedroom in each area of the city. It zooms in to block level, which means that you now know exactly where you can afford to live.
The same website also offers a ton of information about the buyer's market, including median sale prices in the most popular neighborhoods, market trends, and average listing prices. Some of the data is updated every week. The rental map is compiled from prices over the duration in 2013.
· Philadelphia Real Estate Overview [Trulia]