It's all about the location at Mirablau. Although there are worse disco/bars in the city, there are certainly better ones too. But you don't go for the music, the bar prices, or the crowd -- you go for the view, as Mirablau is situated right next to the funicular near the top of Tibidabo hill and has a huge window overlooking the twinkling lights of the entire city, from the hill to the sea. It's open during the day for coffee, but the view at night is something else entirely. If it's pretty enough to help tune out the music, all the better.