Melonio is a rather strange little bar. The walls are covered with porn and heavy metal posters, so it might not be the perfect place to bring a date. Note the informative piece of paper above the urinal. Picture 3 is from the entrance of the ladies' room.
A fine basement for rock&roll concerts, this one. Not the most underground of the basements Buenos Aires has to offer - entrance and beer are more expensive than elsewhere, and smoking is only allowed in the back - but it's a nice place.