Question

What article (a/an) should I use before hostel

Answer 1

it should be the hostel... but if we have to from a or an then it would be a hostel.

Answer 2

HI dear friend here is your answer,

We can say both the hostel a hostel.As in your options the is not given so
we have to use a hostel.

AN can be used for vowels.They are a,e,i,o,u.
A can be used for contegents. Like b c d f j etc

HOPE IT HELPS YOU