My wife and I spent 2 nights in the Radisson Blu Balmoral in Spa and came back extremely relaxed and positively happy about the whole package: the room (we had one level above standard) was excellent and the rain water shower a pleasure, the service - from the cleaning lady to the restaurant - was beyond reproach, everybody made us feel welcome!
Initially we wanted to go "out" for food since the Belgian Ardennes are known for the excellent food served, but since we were too tired we decided to eat in the in-house restaurant "Entre terre et mer". The place was a lot more "cosy" on Friday evening than on Saturday, since there were fewer people, but as far as food quality and service are concerned, we were excellently served (we had the menu's on both days).
If we ever go back to Spa (unlikely) we will certainly choose the same hotel, but we will positively look for Radisson hotels in the future!
This review is the subjective opinion of a TripAdvisor member and not of TripAdvisor LLC