Does anyone know if "Encuentro" or other swing cluns in Madrid are still open?

Has anyone been to another club that they can tell me about?

I don't know much about swing clubs by personal experience but for having a drink once to see one of them. So, I can not recommend you any, but I can tell you I have heard of a good number of them. Definitely, there ARE swing clubs in Madrid.

I was to one in the Arturo Soria area, but I honestly couldn't tell if it was good or bad.