Safety in Cape Town is not what I wanted it to be. That being said, this hostel is very safe, has a guard 24/7, is gated, and is very safe inside the hostel. Don't go out of the hostel unless you're with locals. Even large groups of 5+ were targeted in the tourist areas, so uberX is very necessary if you want to keep your phone and money.
Staff was accommodating and friendly, breakfast was great. In spite of this hostel being in the heart of the touristy neighborhoods, we did get mugged right outside of the hostel as did a group of British guests the same night during our stay (ours at knife-point, the Brits at gun point). This seems to be just how it is in Cape Town is though , and more generally, how SA is, so take uber/ uber X if you're going out of the hostel at night.