Airin is a great host. She'll go out of her way to really help make your trip a wonderful one.
She even helped us book and arranged a private transportation upon our arrival at Haneda airport as well as on the day of our departure. We are a family of five with lots of luggage in tow. It would have been a challenging walk from the train station to the apartment. If you are a light traveler and would not mind taking a 10-15mins walk to and from the train station every day, then Airin's place is a great one. Once you reached the Sangen-jaya station, it's just a 3-min and two stops train ride to Shibuya station where you can get to anywhere you want to go in Tokyo or to any major cities in Japan. It's in a nice and quiet neighborhood, close to some restaurants, big 7-Eleven, and other grocery stores.
Airin personally welcomed us to her place. Her apartment is nice, clean, and well provided: from the slippers, kitchen utensils and table wares, rice cooker, refrigerator, microwave oven, bathroom supplies, bath towels, face towels, hand towels, washing machine, etc. She even provides for washing detergents, softener, and yes, paper towels. She also has a very nice high-speed mobile wi-fi that you can carry along wherever you go. This is truly a delight! There's really nothing else you can ask for...especially compared to what you would normally get if you stay in a hotel suite.
We can highly recommend Airin's place to anyone.