We (two adults and an eight year old) stayed in Akari's place for over a week in December-January.
Akari was super responsive and helpful. And the location is excellent, with many great restaurants, supermarkets, shops, and a subway stop all within easy walking distance. The place was a little smaller than it appears in the photos, so if four adults stay you'll need to be very close friends/family indeed. But it was clean and overall well stocked with linens (though no top sheets), towels, toiletries, and basic kitchen fundamentals. So all that was good.
The major problem is that the place is FREEZING COLD. There is one small air-conditioner/heater but that's it, and that is at the far end from the semi-private 'bedroom', so the first few nights we barely got any sleep as it was just too cold. But then we told Akari and she arranged to have a heater brought. This improved things greatly, but it was still uncomfortable.
So, fine for Spring and Autumn, but not Winter!