I went to a metal gig in Zlin and thought this was nice play to recover at... and it was. You obviously get the usual classic Czech silliness like two single beds pushed together making it a double. This seems standard across the country unless you to 4* plus. Room was however very clean and pretty modern. I suppose given this is a spa... the bathroom was very good - if I was picky, then the shower head's height isn't adjustable. There was a decent fridge with plenty of beer to start the night - and not overpriced beer. Excellent wifi. I can't talk about sleep quality as I probably had too much to drink at that point to judge that... but I do remember one strange thing. When waking up in the morning I thought I could hear music and wasn't sure where it was coming from. Given I was half deaf following the metal gig, any noise was rather irritable. I then noticed that there are small speakers in corridors (outside of the rooms) playing the softest (not loud) music. Not sure what time in the morning this was playing from, but thought that was rather strange.
One thing that was definitely excellent was the breakfast. You need to order this the evening before and need to pay extra on the top of your accommodation. That's 99 CZK, which is just over £ 3. So worth it.
On overall, I think this was pretty good place and ideal in my circumstances. Can't comment on the spa side of this place, as I didn't use it.