As far as I know, asking and attained rents are the same. I think it's sitting tenants who see rents in other properties dropping who want to negotiate rent reductions. (And if they can't they just move to a cheaper place, leaving their landlord to be forced to rent the place out at the reduced rent the original tenants wanted but to new, unproven tenants).
If you pitch your rent too high on Daft you just won't get any responses. I would advise against the "special offer" approach as it may (if not downright would) make prospective tenants suspicious that there is something wrong with the place, and they will pass on to the next listing.
Pitch the rent at what the other, similar properties on Daft would suggest, and make sure you post several good pictures of the (cleaned up) apartment - make especially sure the "front" picture looks good (i.e. not just a picture of a badly lit empty bedroom with a bed with an uncovered mattress on it)