The beds were uncomfortable, although this is normal for westerners in Japanese beds. Bring a pillow or get a western-style if this is a dealbreaker. The refrigerator power outlet went out early in the stay, but we used another outlet. The location is fantastic, very close to Hasunuma Station, the entrance is 15-20 feet from a 7-11 and there are plenty of restaurants and such around. Kamata Station is a short walk away, loaded with everything you need, and largely devoid of the loud, tourist-y nonsense you'll find elsewhere. Highly recommended.
it was more spacious than many of the properties in this price point. The pillows were laughable and the air conditioner remote was difficult to navigate, but all else was really good once we figured out we had to check in/out .5 miles away.