We stayed here for two weeks and it all went smoothly. It was easy to check in and check out at anytime, which gave us more freedom. Seiji also provided us with fresh towels every other day or so. The kitchen, as mentioned by others, is not really for cooking, but there are restaurants close by which makes up for that.
As we were a couple, we preferred to sleep in the same bed, so keep in mind that the bed in the photo is a single bed. We put the futons on the floor and folded the beds up. Seiji was fine with this.
The only inconvenient thing was the placement of the plastic filter. Make sure you don't step on this as it can break (as we did).
Overall our stay at Seiji's place was perfect for us and would definitely recommend, especially for value.