When I lived in Madrid, I was a regular here. The place is run by bunch of friends (I seem to remember they're Moroccan) who make great cocktails and quality 'cachimbas' (= shisha). They are also super friendly - when I'd come back there after not having visited for a week or two, they'd ask me "where have you been, we missed you!". The venue is small and cosy, with rugs and pillows on the floor everywhere. We used to come here before going out - but sometimes we'd have such a good time that we wouldn't leave at all. Yambala gets crowded easily, though, so make sure to arrive on time if you want to get a table.