Do you guys not remember the rental market in the 90's and how expensive things were then? From what I can see, rents today are at the same level as they were nearly 15 years ago.
I remember my old landlord in Galway city centre telling me about the house he bought in 1996. In the twelve years that he had owned it, the rent had never gone up despite it being in a prime location and priced at the market rate.
As for your comment queenlex, the average monthly wage people take home would be about €2,500. If rent is €500, then they're paying 1/5th of their wages for accomodation. Historically when you rented, you tended to pay 1/3rd of your wages on rent.