Try out CraigsList too, sometimes you can find gold on there apartment wise (at least for Cambridge/Boston area)

Either Kendall or Central sq I would say. I lived in Central for a few years and could walk or take the T anywhere I needed to go. Lot's of coffee shops there, good restaurants (lil donkey), a Target, pharmacies, some live music (idk what's up with the middle east rn), and a Trader Joe's down by the water (Cambridge port). Could look for a sublet if it's just short-term, most likely can find a few furnished ones in the area

I would suggest taking the T into Boston for the day, either seeing the parade or pub crawl but the energy's usually fun in the city.

Bagel World in Reading MA

323 Main St, Reading, MA 01867

The Fenway Victory Gardens

MiniLuxe, located in Boston and surrounding areas but not in Cambridge or Somerville unfortunately