It's just as easy to find a two bedroom or one BR+den apartment for 2-2.5k/mo and split it with another intern (or two) and come out well ahead. I know tens of people who did this successfully last summer virtually without issue. The big companies provide generous housing stipends, if not corporate housing, and allocating 20% of your essentially untaxed salary towards housing is well worth it to be a few blocks from work and in the heart of the tech community.