I booked for two nights, and as an individual guest, I was given a room on the 8th floor. Let me cut straight to the chase: the soundproofing is abysmal!!!!! I've never stayed in such a noisy hotel. The windows offer almost no sound insulation; you can hear every normal car passing on the street outside, not to mention the deliberate revving of engines and loud exhaust pipes. After 10 PM, an ambulance would pass by every ten minutes or so, and the siren's piercing sound was so strong that even with earplugs, I couldn't sleep. I woke up at least three times throughout the night and slept for no more than 5 hours.
Around 2 AM the next night, I couldn't take it anymore and went to the front desk to complain and switch rooms. I moved to the 11th floor, but I could still hear the ambulance sirens. I requested a late checkout, but they only extended it until 12 PM.
I can only say that if you're not a Globalist (Hyatt's top tier), I wouldn't recommend staying here. The treatment for individual guests is terrible. The Mitsui Garden Hotel Yokohama Minatomirai Premier I stayed at before completely outshines the Hyatt in every way – great views, excellent service, and they even offered a complimentary upgrade. Aside from being close to Yamashita Park, the Hyatt has almost no advantages. Outside the window, there's nothing but dilapidated office buildings and a busy road. The breakfast was also terrible. There's no comparison!
P.S. The accompanying picture is the view from Mitsui Garden Hotel Premier, directly facing Minatomirai. The Hyatt's view was so bad I didn't even bother taking a picture.
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