It wasn't a double room mentioned. It was a tiny one-bedroom. I booked the room shown in this picture but they offered me the tiny one!
And all staff were friendly.
翻訳
ホテルからの返信: Dear guest, First of all, thank you very much for your good review, sorry for bringing you a bad stay, I hope that the next time you stay, you can feel our change. We look forward to welcoming you back again in the near future!