We stayed at Maison Nagasaki for five days during the winter season. The room was not as expected. The house was dirty: we found rubbish behind the sink, stains on the blankets and a literal pair of dirty underwear near the washing machine.
Both the boiler and the vacuum cleaner did not work.
However, the worst thing of all was how cold the room was. Even if we kept the heater turned on all night it was still freezing. We had to wear gloves and additional clothes in order to sleep. It was still cold.
There were also some positive sides: the neighborhood is really nice, the house is located next to two convenience stores and the metro is near.
But overall, I would not recommend this place.