Someone told me that a Madrid there is a little known place, an apartment that at night turns into a bar. The dream of many University students is to be able to pay the rent by doing small jobs.
Legend has it that some Madrid students have started building their own clientele at home using their own apartment as a bar to pay the rent. Who has been there tells of the best cocktails in the city, i best mojitos.
Those unfamiliar with the apartment will struggle to find it without the right directions also because from the outside the house looks like a normal apartment. I've never been there, but they tell me about a place to try. Like every legend I cannot give you precise indications but only one street of Madrid to follow, if you can find the apartment, let us know :)