Caithy is right - there is no pool INSIDE the hotel, only a small fitness room with a couple of machine, but there is a pool, and a larger fitness area, in the Conference centre next door, even connected directly underground, but additional charges apply.
I am sorry but I do not know if there is a pool. but I don't think so, and there was nothing to indicate that there was
Hi, they have an indoor pool in the connected building. I don't know whether it really belongs to the hotel, but anyway you have to pay extra even if you are a hotel guest. I can say nothing about the pool itself as we were only planning to go there but found no time for that.
Get an answer from Holiday Inn Prague Congress Centre staff and past guests.