"Is the young man in Rome?"
Translation:Estne iuvenis Romae?
Sentence structure is really important in Latin, as changing the word order changes the emphasis, and sometimes, the meaning.
Estne iuvenis Romae or Estne Romae iuvenis, should both work. Just report it if it's not accepted.
In one case you emphasise "in Rome", and in the other one, the subject.