My stay at Yuka's apartment was great! An excellent set of instructions meant I could locate the (self-check) in apartment very easily. The apartment itself is newly renovated and spotless - it was the perfect size for a solo traveller like me. Other guests have written about the highway (which is basically just outside) but, like them, it wasn't really a big issue. The double doors from the balcony help keep most of the noise out.
Yuka enlists the help of a management team to look after the property and I found them to be very responsive and helpful with any questions I had about the area. Hatagaya is pretty great - there is an excellent coffee shop only a few minutes walk from the apartment, as well as a tonne of restaurants, bars and convenience stores. A really great place to observe every day Tokyo neighbourhood life, away from the hustle and bustle.
All in all a very good stay.