There's really nothing to complain about, considering how good the deal is. The price is extremely cheap, yet the hotel has everything you need.
For example, inside the room there is a washing machine, and the entire bathroom can be turned into a dryer which dries your washed clothes within a few hours (and definitely overnight). The room is very small, so come prepared—however, you know how small it is when you book it, and that is partially the reason for the very low price, especially considering its prime location and the amenities it offers.
If you choose to stay more than two nights, you can also opt into the "cleaning-free" service. They will not enter your room, but every day, if you put your garbage and used towels in plastic bags outside your door, they will give you fresh ones and hang them on your doorknob. This includes fresh towels and one bottle of water. When you check out, each night you opt in for this greenless service will result in a refund of 300 yen.
In addition, as long as you are staying there, they offer 24/7 access to soft drinks and coffee on the first floor. They also offer a lot of bath amenity options on the first floor. The staff members are really ready to help, although their level of English is limited. However, if you know what you are doing, you can complete the check-in and check-out processes just at the kiosk.
It is really perfect and very good for the price.