Poor AT&T reception for cell phones (but still a nice hotel)
The hotel is very nice but the signal on my AT&T Iphone was very bad (other than in the lobby) - a lot of time had no reception at all. 
I was also plagued by Internet problems multiple times - the Internet help desk is just unreachable. Tried them three times and waited forever in the endless waiting queue (I guess a lot of other people had issues as well), never was able to reach anyone. Front desk was not capable to help with this.
$20 for a lost umbrella??? First time see I something like that at a Hyatt. At many other Hyatts umbrellas are complimentary during rain!
Other than that the hotel is very nice and service is the staff is very helpful and friendly.