The good: spacious (by Tokyo standards) with separate sink, shower/bath and toilet, large beds (by Tokyo standards, even for a taller person), close to metro and multiple grocery stores, heated floors for those cold winter days, washing machine, speedy wifi.
Things to improve: multiple burned out lights, some ceiling lights were missing the reflectors so even with working bulbs they were quite dim, previous guest’s food in the freezer, toilet seat wash functions not working, stains here and there on the walls, sofa etc., staff could not initially find my reservation when checking in.
Overall, the apartment, and the building, is starting to get a bit run-down and could use some maintenance and sprucing up. If you can look beyond that, all the needed fundamentals are there, some of them pretty good even.