I see your information about prostituion in Buenos Aires is slightly out of date. There are currently many possibilities of picking up a girl here. It all depends on how much money you want to spend. You can find the phone numbers reading the classified ads of Clarin or Ambito Financiero. You have to call and ask what kind of services they offer.
Rooms are nice, air conditioned, and clean.
The thing I like best about these places is that you are not pestered by the girls. They won't come to you except if you invite them. The other way to spend a nice moment is to go to a men's club. It's relaxing, sometimes funny, you can have your drink and look around, sit down with a girl you like, get 'in the mood', and when you're ready, ask her to go 'inside'. Most of them really know their job.