I think CraigsList.org is dying in relation to rentals and usefulness. It’s a mess.
You can search MLS rental listings on our website with good results. However, just so you know, these rental listings would require you to pay a full real estate fee equal to one month rent.
Perhaps also try http://www.rentalbeast.com/search/MA.rbh
Here’s an article that references a few other sites for rentals: http://bostinno.streetwise.co/2012/05/09/skip-craigslist-this-year-5-websites-that-can-ease-your-apartment-search-in-boston/
I’d love to hear what worked best for your rental search!