Slovénie

Hi ! I am a student from Belgium and during this Holidays I would like to go to Slovenia, in September. 
I was wondering if someone could give me some advice. I need some information for the housing. We are 5 student girls and we are going to do a trip, so we would like some quiet cheap housing like  youth hostel but also in  safety places.  So if you know the places we have to visit absolutely, I am listening from you! And also informations about the typical food, etc. We want to remember this trip ! :) 
Thanks !