I stayed at Masami's place for 3 weeks as I explored Tokyo and the surrounding area. It is located in a quiet residential area, so if you're looking for some peace and quiet after a long day then it will be ideal for you.
Masami provides extensive instructions on how to use everything in the apartment which is very helpful and not something I've experienced anywhere else I've stayed before.
The apartment is about a 5 minute walk from Hatagaya Station, with regular trains running from there to Shinjuku so it's very convenient for getting around Tokyo and makes getting to and from the airport a breeze.
The apartment is quite spacious by Tokyo standards and also comes equipped with a fridge, microwave, kettle, television, washing machine, etc. Everything you need to make your stay a pleasant and comfortable one.
The apartment is also a short walk from a busy shopping street filled with convenience stores, restaurants, drug stores, etc so if you ever need anything then chances are it will be close to hand. It definitely came in useful for me on more than one occasion.
Overall, Masami's apartment was everything I had hoped for and was priced very reasonably. I will definitely be staying again when I'm next in Japan. I cannot recommend it highly enough.