The staff at check in are fantastic. The room is very small and the decor is tired looking, more like a 3-star hotel. I was so disappointed when I opened the door and immediately thought that I had been given the wrong room. The layout of the room is difficult, I had to crawl over a bench to plug in my accessories. The windows were dirty from the outside. I asked for another room as soon as I saw it (I had deliberately booked the larger deluxe room so I assumed the staff had made a mistake, because the furniture looked so worn and the space was tiny).The shower has a water restriction so there is no adequate water pressure. I had booked the room for more than one week expecting to be able to work inside the room during the day, but I saw as soon as I check in that it would be impossible. I stay in Bangkok almost twice a month and I stay at all the 5 star hotels. The room size and presentation cannot compare to competitors in the same price range - the Kempinski, the Banyan Tree, the hotel W (huge rooms) the Lebua (which is cheaper than your hotel but has 66 m rooms and balconies and a kitchenette), the Conrad, the Chatrium (again, 66m rooms with balconies), and even the Intercontinental. The Grand Hyatt hotel cannot compete against those hotels. The cramped rooms are more like the Novotel or the old Dusit Thani. Also, the US corporate idea of providing gold card priority and of restricting the water pressure in the showers is alienating to guests. No one is interested in weird american corporate culture in Asia. Finally, the breakfast buffet was poorly organised. Nobody seated me (I came from the elevators and did not know that I should walk around to the official greeting desk, I noticed that most people enter directly from the elevators and that nobody greeted them.) I had to find a staff member to seat me. The staff refused to cook me a crepe (go to the breakfast buffet at the shangri la, the oriental, the lebua, where staff are making crepes and serving them with cream and maple syrup), my eggs were sent to the wrong table, nobody seemed to be assigned to my table, the waiters always seemed to have their backs turned to me or were running away to the kitchen, the cook was grumpy and uncommunicative when I asked about the buffet (someone had to go find him in the kitchen), the guys cooking the eggs seemed unhappy. Again, compare this to the exuberance and happiness of other hotels in Bangkok. The breakfast area is dark and feels lonely.