Sie-Hang C.
Google
Let me start of by saying this place looks really nice. Great interior design and situated in a very nice street.
The reason for 1 star is the following: for a cocktail bar, this place serves uninspired cocktails and they aren't tasty at all. If your idea of a cocktail is a vodka Redbull or similar, then yes, the cocktails are amazing. If you compare this to what is served at other, real cocktail places, in Madrid, then no, they are not on the same level.
I also tried the pastrami sandwich. It's not a pastrami sandwich. That would've been OK though, as long as it was tasty. Unfortunately it's not. It was even a little sour. A shame really, this place looked so nice and central, it could've been a great hangout spot