I took my diving class in Big Blue and all the staff were amazing!
I got the free dorms because I was taking the class and I have to admit, most of the room are great... exept mine!
The AC was not properly working but at least they managed to add new fans to the room.
On the last day, they also offered me to get another room!!
In sum, the staff is great and they are there to help you!
I recommend this hostel :)