We LOVE Fleur.
We have been to Fleur many times, including during restaurant week. The food is always delicious, but go during restaurant week if you can because you'll get to try some really fun, creative dishes.
Every time my husband and I go to Fleur, we love what we order and we have a wonderful experience. The wait staff is always attentive and kind. The ambiance is very warm, relaxed, and inviting. We prefer to sit inside the restaurant rather than out near the bar--it's more enjoyable to be away from the casino foot traffic.
Fleur serves small plates, but you can also order a normal meal. We aren't tapas fans, so we usually order steaks, which are always cooked perfectly.
We saw Mr. Keller himself walk out of the kitchen the first time we ate there, and it was a real thrill to have the chance to compliment the chef :)