Hello, local here. This site was useful when I was in the UK, so I'll return the favor.
Strip bars are there to get money out of foreigners. They are very expensive. If that's still your thing though, ISG could be good as suggested above, to see what the other foreigners like.
All of the "escort agency" sites are infested with fake images. I wouldn't get a girl from there.
The go-to places are
rosszlanyok.hu (many girls)
beszamolok.com (real reviews and more massage)
Fake images are very rare here, they get reported quickly. Shopping is allowed though, but it has to be mentioned on the profile page. Also check when the images were taken. Check the weight too, they're good at hiding fat.
If the girl's intro says "kedves rosszlany var", those are almost always gypsies. Some girls in District V are shopped beyond recognition.
The reviews on rosszlanyok are usually useless, everyone gives ***** or * if they liked it or not. Some of the reviews are fake here. The tags are useful when in large numbers.
Reviews on beszamolok are real and detailed. Some very highly rated reviews are just trying to court the girl for the time when they go back to her though.
The standard rate is 20Khuf/hour, you may have to pay more as a foreigner. Many girls won't take blacks. Nothing personal. Most black people in Hungary are refugees from Africa and about 50% of them have HIV. They also have no money and want sex. Some massage girls may not take asians, as some chinese guests are known to try and force the girl to have sex.
Most of the girls expect an appointment for the same day. Call without hiding your number.
Some massage parlors only do handjobs, no oral. Check the services. If the girl's name starts with "happy", no oral. Same for some of the central massage parlors who don't advertise on these sites.