Coffee makers are not available at many of teh WDW resorts.
Irons and hairdryers are available at all on a first come, first served basis. Somebody did complain once on these boards that they were not able to get one or the other (can't recall which) at one of the resorts during their stay.
There is no charge for them if they are available. You can't reserve them in advance, just call housekeeping once you get into your room.
Anne