My favorite way to pick a provider is to go to where there is the ladies on the street corners. Like that one sweet street in Sao Paulo. It went for a mile or 2 with the T-ladies on every corner!
Or it can be good to go to the building where there is a lot of them, and they can be paraded past you. Then you can pick one of the ladies. They're popular in Spain! Usually those places have the girls checked, health and legal. The closest place I know like that, is San Jose, Costa Rica. And also in Colombia. A buddy there gave T-lady tours.
My first time was when I had 4 of the ladies jump in the car. That was in Panama City and none of them could speak english. The next time I flew down there, I met the best T-lady and her name was Carla!!! She was beautiful and very loving, and into any kissing or anything else!!! I've learned how to get by, when you are in a country where they do not speak english. Like now holding the phone to a interpreter / translator. Or you can just have someone at the hotel check-in, talk for you on the phone. And have them get you a taxi driver that speaks english.
And one last thing on the ladies, they respond well to gifts and respect! Taking them out to a nice place! And a sweet sense of humor! Getting their smile right side up, can be a big help! Going outside of the country might sound like a bit much, but after the airplane ticket, it can be ten times cheaper. Meaning you might see 10 ladies there, for what you see one in America. I met the Miss Trans of Brazil and Panama, which was great!!! Use the "Search" to find the info, that me and others have put on here. Type in the city or other subjects. I traveled a lot for my work. And I took full advantage of it!!!
For travel info, TripAdviser.com is good.
And one last tip, save what you typed in, this does time-out and you can lose everything!