The bar that never dressed itself up
Belfast has plenty of pubs that will sell you traditional music. Madden's is the one musicians go to when they are not working.
The distinction matters. A booked trad act plays a set list to a room. An open session is players listening to each other and deciding what comes next, which means the tunes can stop, restart, and go somewhere nobody planned. Keeping a table free every single night, with no gatekeeping about who sits at it, is the whole reason the standard here stays high.
None of this has been packaged. The walls carry Gaelic posters and instruments because someone put them there, not because a designer specified them. It stayed a Berry Street local while the city changed around it, and that is exactly why it became the address every visiting player asks for.