The secret garden has a reputation of being a place where it is not easy to get into. You have to dress up to get in. sneakers not allowed.
Well.. this might be true on weekends. During the week I guess they are more flexible.

The secret garden is a very comfortable bar but not so easy to find. It is a beautiful old building and inside still lots of wood and candles and fluffy couches. While you stay, you are surrounded by nice chilly lounge music.
The cocktails are delicious and creative. You find the usual ones next to other creations.. hmmmmm.
Price: a bit high.. around 9-13 Euros, which is even high for Luxembourg.
The only thing to moan is that service was very slow.. but this might not be the case every day.