Found!

The Eloisa Cartonera.

La Boca,

 Buenos Aires.

When i saw their books at Pam's and on their web page, and wrote down their address, well, I didn't believe it until i was standing at the front of their closed roller doors.

 I really was there.

 Here.

 Usted esta aqui.

You are here.

 I really was. Truly.