Thanks for posting this Bruno! It brings back many good memories of my days living in Prague. I went by this place countless times, but unfortunately never stopped to go inside. There used to be a junk shop, and an auction house around the corner, both of which I used to stop at. I think the tram line I used all the time went right by this place, which was located at the bottom of the hill near the funicular below Prague Castle, the Loretto, and the Strahov Monastary. I lived about 10-blocks from Prague Castle on top of the hill, and that whole area was very busy during tourist season, with several million visitors in the warmer months. I hope that you enjoyed your visit, and were able to partake in some good Czech beers!
Best Regards,
Alan