Hello gents!
At these kind of brothels with a lineup, Perla Negra, La Vie En Rose, Top Damas, Felina etc etc the absolutely most important thing you need to do is to tell the 'door lady' you only want to see girls in the lineup that provides the service you require without paying extra! For example BBBJ. This way there are far less surprises in the room and you don't need unnecessary haggling with the girl of your choice. I always do this when I visit brothels and with great result I might add.