We stayed 2 adults, 2 teens in a decent-sized room for 7 nights. The location was great - near two metro/train stops - and you could be anywhere within the city in under an hour. It was close to two different neighborhoods with lots of choice for food (albeit Japanese cuisine - sushi, ramen, soba, etc) and much of it surprisingly affordable. There is a Starbucks, if that is your thing, just outside the rear entrance to the hotel. Outside the elevators is also a bakery - a bit pricey but good for bread in the morning for a quick breakfast.
The room's air conditioner, which was criticized in other recent reviews, worked fine or has been fixed. It was necessary during our stay (±35C!) One nice feature of the room is that the curtains' rails have been designed so the 2 curtains overlap when closed (instead of, as most closed curtains do, leaving a few centimeters and allowing morning sun to creep in). Sure, it's a small thing, but it enabled the room to stay dark even in the early morning light. Good for recovering from a long flight.
The hotel lobby did have a currency exchange machine. I'm not sure how competitive the rate was (Euros to Yen), but it is nice to have the flexibility to get money when needed. Note that it was out of order for 1/2 of the week we were there. I suspect these things great down often as the same input slots must accept dirty bill denominations from many countries. There is also an ATM in the minimart (Lawsons) near the hotel elevators.