We stayed for a week at Ken's place. It was really nice, clean and well equiped. The subway isn't far and the road to go there is very quiet. The futons were quite comfy.
The only trouble we had was the bathroom, which is rather small, but it's quite a recurrent problem in a city like Tokyo. It was well arranged so not that big of a trouble in the end.
We appreciated the number of cooking dishes available, which was quite convenient.
Finally, we were delighted by the small attentions left by Ken and his wife to celebrate our honeymoon. We highly appreciated their hospitality.