Yasu's place is located in a very residential yet lively neighborhood in Tokyo, Setagaya. Only two stops away (!) away from Shibuya you get very fast and easy to the biggest attraction in Tokyo. Even if you happen to miss the last train, taking a cab back home won't be that expensive (roughly 2000yen).
The place itself is very spacious and offers enough space for 3 to 4 person. Kitchen and bathroom were super clean. As the walls are a bit thin, be aware that you might hear your neighbor coming home at night or whenever his TV is running late at night.
Overall, I loved staying at Yasus place and would definitely come back anytime soon!