First of all, it’s a farm-to-table restaurant that actually has its own farm (not on site, that is, but you probably don’t want kale that’s been growing in the middle of Harvard Square, anyway). Secondly, it’s a restaurant in a 200-year-old house with a fireplace and a patio. And third, it serves 2-for-1 oysters every single day. If you need more than just those three reasons to hit up the Red House, you’re just being difficult.