If you expect a fancy room with many amenities, or if you require squeaky clean spaces and a bountiful breakfast selection, this isn't the place for you. We knew this would be a relatively minimalist hostel, so we were prepared for it. The room was fine: safe and clean enough. The space itself was also adequate: room to cook your own meals, should you wish to; plenty of space to look out and watch the sunset. We didn't avail ourselves of the showers (only stayed one night; don't judge!), but the other bathroom seemed perfectly fine. The wifi worked fine throughout.
The central draw of this hostel is that it is literally a 10 minute walk to the Causeway visitors' center, and about as close as you can possibly get to the site. As a result, it's not near the town of Bushmills, so what you gain in closeness to the Causeway, you lose in closeness to the restaurants etc. of the town.
Overall, I would stay here again: the price was right, the staff was friendly, and the location was great.