LOL Danvers and Somerville aren't like the Bronx from the 80s. I've never heard of rats being an issue at any theater anywhere until recently in Methuen, but given how these places look immediately after a movie gets out....I am not surprised.
I have not been to either one, but Assembly Row has a lot going on there. Lots of bars, shops, restaurants etc. Maybe take a look to see what's around there. Of course Danvers is closer to you.