Very good restaurant; everything from set-up to food and service was perfect. We had the tasting menu with wine pairing at 135 Euros each - not cheap but it was worth it.
The atmosphere is rather formal but not over the top. Personally I find the restaurant a bit boring and lacking atmosphere.. but that's just me. It isn't very big, there are only about 10 tables so make sure to book well in advance.
I wouldn't necessarily consider Clairefontaine one of the best restaurants I've been to overall but certainly one of the best in Luxembourg.
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