We were a party of two staying for a period of two weeks. Overall, we had a very pleasant stay at this apartment, but one particular flaw unfortunately left a bit of a bad impression.
First, the good: the Airbnb is very centrally located, only a quick walk from both Higashi-Nakano station (JR) and Ochiai station (Metro). This makes getting to Shinjuku and other areas of Tokyo very convenient. The space is also exactly as shown in the pictures, is neatly decorated and feels spacious despite being a studio apartment. The entire space generally felt new and clean, which is a big plus.
Unfortunately, there was one major flaw which put a damper on our experience. Over the course of our two-week stay, we made use of the kitchen space to cook our own meals several times and naturally generated a fair amount of trash. However, house rules directed us to keep all trash inside the apartment for the duration of our stay. As we accumulated trash, we contacted the host to see if there might be a location for us to drop off our trash bags. Aya responded that we could leave our trash outside the apartment door and someone would come to pick it up the next morning, but no one came. As the trash bags sat outside our apartment door, flies started to gather, and we had to clean up, use bug spray and double-bag our trash to keep them from coming back. Finally, at the end of the trip, we moved the trash bags back into the apartment as directed, but we were horrified to find that the flies had laid eggs around the trash which we had to also clean up.
This is a bit of a long-winded anecdote to warn that there is no system in place to get rid of your trash if you are staying for a longer period, as we did. If you intend to cook in the Airbnb, it's hard to avoid accumulating trash, and there is currently nowhere to put it. This may not be a problem for those who do not intend to cook or who only plan to have a short stay, but it was an issue for us. Despite this, our overall experience with this apartment was good – I think if the hosts could just find a solution to the trash problem, we would have had a perfect stay.