TL;DR: big apartment, great location, not very personal or welcoming, kind of hard to use (if that's even a thing), moldy shower/bath.
This apartment is in a great location, and it is pretty big (even if you don't count the tatami room, which we did not use---more on that later). It was comfortable for our family of four adults, once we finally figured out how to turn on the heat. The walk up from the street might be daunting for families with young children or less able-bodied guests, but it was fine for us.
However, there were issues. First, the listing comes with a user's manual (tiny URL posted in the listing and sent multiple times through messages). I printed it before we left home, just in case we had internet issues, and even removing a number of unnecessary pictures and reducing the font size it was nearly 15 pages front and back. There are just so many rules and instructions!
The check-in process was definitely clunky (climb up one extra floor! make sure everyone in your family is standing there! be prepared to cluster in front of an iPad and take a 10-second video when all you want to do is go put all your stuff down! what fun!).
The light switches are plentiful inside this apartment. Many of them are taped over, but if you accidentally press one in the dark because you can't find the correct switch, you may just shut off all power to the apartment. In addition to the light switches, there are "DO NOT USE" stickers taped on quite a few objects: the heat/AC unit in the kitchen, the dishwasher, the tea kettle and hairdryer---you can use one or the other, not both. And while I completely understand the rules surrounding the tatami room, the combined message of all these warnings and prohibitions seemed to be "you are not welcome."
There are no personal touches. Unlike every other place I have stayed with Airbnb, this one is clearly a team-run business. Yes, the promised amenities were present. But there were no welcoming snacks in the fridge (an above-and-beyond gesture that I always appreciate), nor even the basics for coffee or tea prep. There is no ice; there are no ice cube trays. There is, however, a piano (???) in one of the bedrooms and the washing machine in another.
And then the heat. We stayed at the very end of December into January, and it was in the mid 40's (F). Not that cold, but definitely chilly. The apartment has FOUR different types of heating units, each with different controls. Only two of these are explained in the user's manual, and one of those is the kitchen unit, which has a "Do Not Use" sticker on it. We weren't sure which to believe, so we tried to use the kitchen heat. It worked great for about 5 minutes and then the entire apartment was plunged into darkness. OK, so , Do Not Use. My younger son and I spent about 30 minutes with all the remotes lined up, figuring out each machine based on the others. Thankfully, there is a huge stack of blankets in one of the bedroom closets, so we were all bundled up during this baffling process. I know this would probably have been simple if we knew more Japanese, but we don't. It was difficult, and it remained so throughout our stay since the main living space heater was always off in the morning when we woke up, for no reason we could ever discern.
One last thing: the pictures of the shower/bath must have been taken a long time ago. There is a LOT of black mold in the grout and in the wood of the tub, stool, and bucket. It doesn't smell great. The water is hot (we didn't have any trouble with it, despite many warnings in the user's manual) and the pressure is great; it's just sort of gross in there.