Very convenient location within a few minutes' walk of the Nakai and Ochiai subway stations. Didn't follow directions on the check-in instructions but just checked Google Maps street-level photos to see how to go from Nakai Station.
Very clean.
Host very quick to respond.
Lock-box allows for late check-in.
Wi-Fi has a 500MB/day limit, but that wasn't a problem as we mainly used our own portable Wi-Fi while out.
English address provided in the Airbnb emails was incorrect. Ask the host for the check-in instructions, which have the correct address (in the Google Maps link).
It might be helpful to know that the wall air-conditioning units are also heaters (hinted at in the host's a/c instructions, which included mention of a heat mode). The host has printed instructions in a few languages for almost everything. Also, there are extra hangers in a closet in the main bedroom.
Very minor points - the toilets often kept running (perhaps you have to turn the flush handle completely back and forth), the shower doesn't have a place to change (we used the small room next to it, closing the doors to the kitchen and second bedroom) and the frosted glass on the shower door perhaps was installed the wrong way (allowing people outside the shower to see in).