Good hotel - with some draw backs
I stayed at the Grand Hyatt for 11 nights. Let's start with the good things:
- The location is great. Grand Central Station is right next door. 
- The lobby of the hotel is wonderful, a real treat for the eye.
- The room and the bed were spacious and comfortable.
However, there were also some drawbacks:
- When I checked in, they put me into a room that wasn't clean yet. But they immediately moved me to another room after I complained.
- The new room had a window with a view of a wall of the other side of the hotel. That's the only thing I could see, so I decided to just leave the curtains closed. Without a watch, it would be impossible to tell if it's day or night in this room.
- The door handle of the walk-in closet was broken.
- The shower was difficult to operate.
- Most tv channels were fuzzy and in low quality.
- Sometime I would wake up in the middle of the night because some of the neighbors were too loud.
- One day my room key stopped working. I needed to wait 10 minutes at the reception until it was my turn and someone would finally help me.
The hotel staff tried to solve all of these problems, and was eager to hand out vouchers for free coffee or water as a compensation for the problems. However, I think that the hotel does not live up to the promised standard. And given all of these imperfections, the rates are way too high. Overall, my experience at the Grand Hyatt was ok, but I doubt I will go there again.