Very disappointed

My friend and I did our usual check of Trip Advisor and the ReviewCentre before booking our acommodation in Dubrovnik months in advance. We saw Roko House with it's fantastic reviews, amazing photos and ideal location and looked no further.. However when we arrived at the accommodation we were bitterly disappointed. The landlady seemed nice enough, however, when we presented her with our hostelworld.com documentation she said that the price was an extra €12 per night and I had not paid my £15 deposit eventhough it clearly stated in the letter that I had. For a prime location in the centre of town I thought fine, an extra £20 or so wasn't going to break the bank.
However, we were then shown to our room... Rather than the clean, elegant rooms that are shown in these pictures we were presented with an attic room with old furniture and junk cluttered all over the place, random towels and bed sheets stacked across the room and a cracked skylight. Plus 2 washing machines and a full array of cleaning products in the bathroom!! It was nothing like the "beautifully decorated modern rooms" with their "delicate designs" that was sold to us by hostelworld.
We found the landlady in one of the rooms downstairs which looked like the pictures and asked whether we could stay in one of the proper rooms and she said these would be double the price. I said I would pay and she said no I was being ridiculous and to go out and just have fun. I said no I wanted to sort this out but she refused. We later moved to proper accommodation