The best thing about Yasuko's place is the location. Very close to major stations, but just far enough to be in a quiet "local" neighborhood with dining and bars still available at a short walk. Definitely the best of both worlds.
Although, we were not thrilled with the couch bed. It was not comfortable and the comforter had a fist-size brown stain on it. The towels also could have been better as they didn't dry well. Not a huge concern for us, but I know these things can be a deal breaker for some.
Overall, good stay for a short trip to Tokyo.