My family stayed in Yuka-san's house while we were in Tokyo before we flew back to Singapore. By then, we had loads of luggages and other items so the generous space available at the house was very much welcomed.
The house is really near to Yoyogi station and had plenty of eateries along the way. Walking over to Shinjuku station is also convenient.
The toys and play area in the house also kept my 3 year old nephew entertains for a while every day while we did daily preparation before going out or packing at the end of the day.
However, as there are some eateries along the same lane, we found Fri - Sun nights a tad noisy as the customers of the eateries tended to hang around in the lane, chatting away past midnight. Otherwise, the neighbourhood is pretty quiet by 10pm.
We would consider staying there again should we travel again as a big family.