My wife and I stayed for a week in Eden au Lac.
The location is superb : on a hillside, just outside Echternach, with a nice view at the small city.
The food is the best we have ever had : every evening a 5 course diner, with a very good balance and not too large portions. Some of the dishes were really very surprising : creative combinations.
Wednesday evening there is a starters and dessert buffet and saturday evening a full cold and warm buffet : including lobster !
The service is very stylish : you are treated as a prince !
I can only comment about the room we booked : top floor with a large terrace and airco (not all rooms have airco).
Fitness is very well equiped : many recent equipments.
2 large swimming pools : one inside, one outside.
Hotel has a wellness center, but we didn't use it.
You can debate whether the hotel is worth its 5 stars : I would rate them between 4 and 5. But it is certainly value for money, no doubt about it.
We talked with some other guests : mostly belgians : some of them visit the hotel already for 25 years.
The "average" guest was older than 50-60. But also families with small children.
We certainly will go back !