This was the cheapest Hostel we booked on our recent trip to Barcelona. My gf and I got the private room for 17 Euro each per night -- very cheap. Location was good, very close to the beach. However, appartment was mucho basic. No kitchen, tiny little fridge in someone else's appartment, tiny room, sketchy sheets/covers, mosquitoes, and terrible washroom/shower.
We stayed three nights and I was losing it. If your with your gf and can afford the 20 Euros more per night, you are way better off doing so and investing in a little more comfort !
Good place for backpackers/group of friends on a tight budget though!