This is exactly what i put too. Is it not correct? It basically means the same thing in English.
I tried the same. The official English solution suggests the comparison "like here", but derives from "to be like". The word order is confusing, at least in English. I always would try to avoid it.
Just to be clear, "What kind/sort of boys are here?" was added several months ago and should be accepted.
I tried out all of the versions of the other comments and that's what i conclude
(1) What are the boys like here? (official solution)
(2) What kind of boys are here? (Correct)
(3) How are the boys here? (wrong) (also my first try, but i admit, it does have a weird sound to it (i'm not a native english speaker though)
(4) Which boys are here? (correct - which in my opinion shouldn't be, because then it should be "Které" instead of "Jací")