New Mongering Etiqutte

I've been reading the posts for sometime, and as an aspiring monger, I have to say I'm a bit curious as to all the odds and ends that are not talked about, and just assumed.

I'm new to all this. I've been to Prague and Amsterdam but was only there long enough to take in 1 girl on each trip. And even then, its rather tourist friendly and business like. Sounds like Buenos Aires is a lot less regulated.

I'll be in BA very soon, as in next weekend. I'll be around for about 5 nights. I wanted to know how the whole "privados" work? Do I have to just show up to an apartment and ring the bell? Is like prague where it seems to be mob runned? Or does one call in advance and say "Hi, I'd like to make an appointment".

Another question is, what is the difference between servicio completo and combinded? In europe I wasn't given those options. Any recommendations?

Please help me out my fellow mongers!