Translation:What are those markets like?
Can this also be translated as, "What kind of markets are those?"
As far as meaning goes, it's pretty much the same thing. But grammatically you've changed "those" from being an adjective ("those markets") the way it is used in the Hungarian sentence, to being a pronoun, so it is structurally kind of different; just something to be aware of, I guess.
And that would be "Milyen piacok azok?" or "Azok milyen piacok?".
I think "how are those markets" should be accepted. Anything wrong with that?
The question is, 'What are the markets?' once the good answer is 'What are those markets like?', and sometimes 'How are those markets?'. Then what's the good one now?