You start with the ad: photos, hours and services listed. After that the exchange goes through WhatsApp and always with her, no middlemen involved. Tell her the day that suits you and the duration you have in mind; with that you already know whether there is room in the agenda and you can keep looking if it does not line up.
Most receive at home, on the inner streets around the rise, but there are also women who do outcalls and come down to the flat neighborhoods nearby or to a hotel in Centro. If that option suits you better, say so from the start, because it completely changes how the rest of the arrangement is organized.
What is on offer runs from short meetings to dates lasting several hours, with massages and with close-contact offers of the kind advertised as a girlfriend for a while; some girls add company for an outing. Every ad spells it out, and that published detail is what counts when you come to agree.
For the arrival, a taxi or a ride app works better than your own car: they drop you at the door and save you parking on a slope, which on several blocks is genuinely awkward. The neighborhood takes care of the rest: these are streets of residents minding their own business, where someone who arrives, goes in and leaves a while later prompts no comment at all.