The atmosphere in the bar was great.
We didn't have a great experience at Hello Hostel. If we were partiers, I'm sure we would have loved it. Our room was clean, the beds were also clean, but not comfortable. The showers didn't have a place, except in the common area, to leave your towel and clothing. You had to bring it into the shower with you, which made the towel wet. The window to our room opened into the bar patio area. We had to leave our window open all night because of the heat. The loud bar kept us up at night.
Great place!! Stay here!! The building is big with large open common areas. The bar and restaurant are very warm and inviting. The room we stayed in had it's own shower and bathroom, which was very nice. The staff were very helpful. We loved our stay here and we will definitely return to the Luxembourg City Hostel!