Nice piece. I found myself at Tacheles back in December 1990 under the same hazy circumstances. I was a Fulbright living off the Ku'damm (Lehninerplatz). A friend visited. We ventured east, walked up that strange street and then stood in a packed ground floor space with a stage and "steh Tische" with industrial saw blades as tops. I remember the band playing was called Öl. We explored inside and out, weaving our way through the ruins, the people and the art.
It was an unprecedented urban historical and subcultural experience. (And, by some way of explanation, I am a NYer who went to Art School!) It was an amazing time to be in Berlin, I am sorry that this sort of unique grassroots space with organic edgy events has become so rare today.