We enjoyed our stay in this apartment. It’s quite large, including two sitting rooms, two bedrooms, and a kitchen with a table and most if not all things you’d need for travel cooking. The color scheme is certainly dark, but there’s good natural (and artificial) light.
We had breakfast and excellent coffee at Darwin’s just down the street, and enjoyed walking into the Harvard Square area in just a few minutes. The Longfellow House-Washington's Headquarters National Historic Site is a couple of blocks away and worth a quick visit if you’re looking for something to do for an hour (but check if it’s open before you go).
If you bring a car, be ready to parallel park and do take note of the various time limits, street cleaning, and permit requirements; we didn’t use a car during our stay because the location is close enough to walk or take transit to things.