Because I was afraid of encountering an unexpected situation, I booked a room through the app instead of finding a hotel directly. The room was successfully booked on November 15 for 2 nights from November 22-24 (2 adults, 1 child under 1 year old) for a room price of over 1.1 million. When I arrived, the hotel reported an error saying the app was currently full and pushed me to the nearby Hanoi Solo hostel (the hotel paid for the taxi) saying that the room price was higher than the hotel's and that I had to pay for it because it was the hotel's fault, but the price at Solo was only around 900k. I had read reviews about the hotel where this had happened, but I didn't think it would happen to me again. I hope it was really an accident and not intentionally done to guests with children who were not convenient to move around. Anyone who books a hotel room should be careful and call to confirm before arriving. I called the hotel 1 day before arriving to ask about the check-in procedure with children, but I didn't ask clearly if the hotel had received my reservation.