The apartment was clean and well equipped, with WiFi (very important!), rice cooker, hair dryer, towels, toothbrush, razor, and more. There is even a box of medicine for various ailments at the lobby. Kyoko-san is a very thoughtful and kind host. Because I arrived very early, she allowed me to check in earlier that day. She also served a delicious home-cooked breakfast the first morning I was there and generously gave me several mikans!
The neighbourhood was quiet and restful. The location is reasonably convenient. It takes about 10-15 minutes to walk to Keio Inokashira Takaido station and 20 minutes from Takaido to Shibuya (local train), so including walking time, it would take about 30-35 minutes from Takaido to Shibuya.
Here are a couple of suggestions:
1. If you take the train from Takaido to Shibuya, it might be slightly faster if you stopped at Eifukucho to change from the local to the express train and do the opposite on your way back from Shibuya (i.e., take express train to Eifukucho and then change to the local train).
2. The ramen shop (beside Matsuya) near the Takaido station serves delicious Hakata-style ramen. You also get to choose how hard you want your noodles to be. The tsukemen was so-so only, though.
One final thing to note: The walls are pretty thin in this apartment (though I've found that to be the case in Japanese hotels as well). So if you are a light sleeper, you may be woken up rather early on weekdays by your neighbour. I did not mind this because I am a morning person, but this may be a concern for some people.
Given the hospitality, the location, and the price, I would say that this apartment is good value-for-money. I would stay here again if I come to Tokyo!