Homes to Swap and Exchange in or near Philadelphia

SabbaticalHomes.com saved me so much time and trouble, especially since I was worried about the prospect of renting in a big city without knowing which neighborhoods would be safe and accessible via public transport. This is the short-term version of a long-term move (I'm renting for the first semester only so I can get to know the city better), so I'll likely be checking out Sabbatical Homes again. Feel free to use my comments if they're helpful...unattributed would be best...... Thanks for what you do!