We stayed here with our baby son and our parents/in-laws for a family holiday.
Really great location, close to T line and buses, 15m walk to Harvard Square. Right by the Cambridge city hall, which gave it a touch of class.
Very comfortable beds, lovely comfy living room, fully equipped kitchen. And an electric kettle, which seems to be a bit rare in the US. The flat is a home rather than a hotel, so has a few imperfections, but that mostly served to make it homely.
Emile, Ann and family were extremely welcoming and very helpful. The hot water broke when we were there, but the hosts sorted it out very quickly (plumber was there very quickly).
Only small issues were that there was just enough cutlery for us, so we had to do quite a few washes. And our son kept wanting to climb the spiral staircase, which isn't really toddler-safe, so we had to block it with an armchair.
Overall, really pleased with the place, would definitely recommend and would stay again.