Stayed 10 nights here between 25.5-6.2013!!
Awesome place. Very clean, nice staff, good location and the all day breakfast rocks! Also have free of charge luggage room.
I stayed on 3 different hostels in KK and liked Masada most! Just make sure that you book all the nights you want to stay beforehand or at least let them know how long are you going to stay. Hostel is fully booked very often, so you might not be able to extend your stay in short notice. They also have separate dorms for men and females and sometimes have to change the rooms due booking situation, so be prepared to switch your bed every now and then.
Still definitely one of the best hostels I have been!