You should definitely check out the Arlington MA Fair and Affordable Housing office. I'm sure they'll be able to tell you about any local apartments that accept Section 8 vouchers. Here's their contact info:
Contact: Laura Wiener , Director of Housing
Address: Housing Office (Fair and Affordable Housing), Town Hall Annex, 730 Massachusetts Avenue
Phone: 781 316-3091
Fax: 781 316 3019
Best of luck in finding an apartment!