There was a problem that the heater turned off only at night, and it was cold all day. I received a blanket, but it was hard to sleep because of the cold air.
Even though the engineer came to fix it, the heater turned off at night.
I kept talking to the reception for 3 ~4 days and eventually I used the upgraded room for the remainder of the stay.
That room was great. heater in room was still weak.
Great amenity, great location.
It is a good choice to stay at this hotel if the heaters in each room work well.