Love love loved our stay here, 4 nights as part of a Central Europe swing. We stayed as a World of Hyatt Guest of Honor and were upgraded into a Park Suite. The room was spacious, high-end, and quiet. The gym had dumbbells, a few machines (leg curl, leg ext, row, seated lat pull down, seated press) and a bunch of treadmills. It also had adjustable Bowflex dumbbells but they were broken. The free-to-use spa and pool were luxurious, with a dry sauna, ice rainfall shower, and steam room. The pool is in what (I think) used to be the bank vault, very cool feeling. Breakfast was great with buffet, other menu items, and full coffee service. Although one of my eggs benedict orders came out with salmon instead of ham, it certainly didn't ruin anything, and I'm sure if I asked they would have replaced it. Location is pretty good to walk all around the inner city, but be prepared for the high prices in the area. Obviously, this is a high end hotel, but just be aware. Walking distance are Prada, Jimmy Choo, Chanel, etc. Also walking distance is St. Stephen's, St. Peter's, the clock, Rathaus, Hofburg, etc. I very highly recommend this hotel and if you can swing it or splurge, you won't be disappointed.