4 starts hotel only in the realm of dreams.
Me and my partner stayed in the “best room in the hotel”, it is the one with the castle view, and granted, the view was great. All the rest however, left much to desire.
The entire room only had one socket working, all others were broken. The shower was so bad we resorted to having bucket adjacent showers in the bath and the bed was below comfortable. The day we arrived, the air conditioner was broken and had a bright light flashing throughout the day, we asked reception to turn it off, which was not done by the time we went to bed, which led to bad sleeping quality as it flashed quite brightly. The next day, they glued a piece of paper in front of the flashing light, that’s it.
When we brought the maintenance issues, sockets and shower, to the attention to the manager, highlighting that after looking at reviews there were similar complaints for over 2 years, he scoffed.
Additionally, do not expect even a nespresso in your room to be complimentary, it was €2.5 for a nespresso if you wanted one, which even Ibis budget gives you as a treat (and no milk around).
All in all, I would not recommend in the slightest, considering the price, you can get something significantly better.
Furthermore, because I did not find this information on their website, other than the very high fee for the room in comparison to the other hotels in Prague, the spa facilities are paid extra and is €40pp per hour.
Go somewhere else.