We had a great time at Kei's place. It is a very nice and quite neighbour of Tokyo.
Because Kei was away on business on the our arrival date, but Kei made it so simple for us to check in there. His instructions and replied emails are very prompt and clear. Highly appreciated it.
The house is very typical Japanese home, and everything is so cosy and convenient.
However, the train system in the Tokyo is the nightmare though, luckily Kei's house is on the direct line with the train from Haneda airport.
Overall, we had a great time there, definitely will come back when we visit Tokyo again.