On arrival we were "upgraded" to a Premium room as the hotel was full. However, the upgrade turned out to be a joke - the room was in the conference wing and much smaller than in any of the pictures; it was one of the smallest and least attractive rooms we have ever had in a major hotel in Tallinn (we visit monthly and have stayed in most of the big hotels).
We soon found out that the room heating did not work. When we asked for a change of rooms we were told the hotel was full, but were given an electric fan for heating - although this was not very pleasant, at least we were not freezing in the room.
Also the spa was a disappointment. On a Saturday it was overcrowded, probably because it was also open to non-guests without giving hotel guests priority access. Three of the 5 saunas were cold, and the main pool was unpleasantly cool. The pools were too small and too crowded to swim, and the two jacuzzis were full (with people settled in them for drinks). The pool bar had a long queue - after waiting 15 minutes we decided to give up and leave.
All in all, we felt this hotel was poor quality and overpriced as other options which we looked at before booking would have been cheaper yet much better value.