This is a first time for me, an article that I can recommend as a must read. This one has a bunch of gems that I think are essential insights to learning traditional tango milonguero in terms of it’s history and approaching the interpretation of music and ear training: Tango singers – It wasn’t obvious that they would exist (2023).
I also came across a website for a milonga in Europe that seems to have the right sort of values. Unfortunately it seems to be a weekend rather than a regular milonga. They say: “Dance like in Buenos Aires, “al piso”, without voleos and with very short steps because we have a beautiful place, but it is not very big.” Thumbs up: Berlin Encuentro Milonguero.