Yukio-san's place was a great size for our group of 4. The rooms were clean and the beds/futons were comfortable. The heaters were effective as the blankets were nice and heavy.
If you're tall, we'd caution you to be careful going through doorways, as they are quite low! Also everyone should be careful going up the stairs as the handrail is not so sturdy and there are some electric cables above it.
We were worried about it being too far away from the city but it only took us an hour on the train to get to Shibuya. We also walked to and from the station easily in about 15 minutes.
We were really grateful for Yukio-san's hospitality; he picked us up from the station when we arrived and dropped us off the morning that we left. He also pointed out places to eat around the neighborhood on the way in, which was very helpful. We would recommend staying there :)