My girlfriend and I stayed at Judy and Steven place for 4 weeks august/september. Judy and Steven are super friendly hosts, very helpful and kind.
The apartment has a perfect location in a quiet neighborhood with very easy access to the red line train that connects to all of the city. Only 15 min walk fro Harvard sq., which is a lovely area with a lot shops and restaurants.
The apartment is on the 2 and 3 floor. Bathroom is nice and clean. Kitchen has got a small table and tv. For guests staying over a longer period, cooking full meals is a bit challenging as there is only a small grill owen, a microwave and one stove - but we managed.
The bed is queensize and comfy. There is wifi, which is good downstairs, but lower signal upstair bed area.
All in all we had a fantastic stay at Judy and Stevens place in Cambridge, and we highly recommend it.