We stayed for 3 nights, on recommendation from friends who have stayed several times before. And boy we were not disappointed - starting with the grand-looking reception with friendly and courteous staff. Polina at the check-in desk deserves special mention for upgrading us from a superior to superior XL room, and providing plenty of details on what to see and do in the city, including a number of places we didn't already know.
The room was amazing - clean with a huge bed, and ornate finishing in the high ceiling. The swimming pool is exactly like the pictures show - combined with a jacuzzi and temperature controlled, so was very nice and relaxing to use in early February whilst it was freezing cold outside! We used the sauna for a bit as well, which was nice too.
We dined at the 1890 Restaurant, the menu seemed a bit small but we both found something we wanted, I enjoyed the Carlo IV burger. The old bank vault that's part of the bar seating area is really cool.
The hotel is located close to the main tourist sites, places like Charles Bridge, Wenceslas Square, Church of Our Lady before Týn etc are all walkable. It is also a short walk from the central train station, from which there is a direct Airport Express (AE on Google maps) bust to the airport every half hour - so can easily get there cheaply rather than use a taxi or other shuttle.
As this trip was a 40th birthday present for my partner, sufficed to say she was impressed! We will gladly visit again.