colenot,
I'm sorry for your sake that you searched for El Cuchi only to find it closed, but based on my experience there, it wasn't very good anyway. I went there a LONG time ago back in my semester abroad days, and it was rather average. I'm from an area with a large Mexican and Mexican-American population, so I really missed Mexican food, too, when I lived in Spain. Hopefully you find something authentic and delicious in the near future!
Well it's good to hear that I didn't miss out on El Cuchi. Seems like we both had the same craving for the same authentic type of Mexican food so I trust your judgement!
I miss
Don Antonio's in Los Angeles! Stay tuned. I'm on the hunt...