I looked into airbnb but found that the majority of the time, hotels didn't cost that much more and usually came with a free airport shuttle and free breakfast. Also, I hadn't thought about it, but the point about the iron being available is pretty solid.
If money is tight, though, airbnb is a good option. Just make sure to look into other costs when you compare between the two (like the cost of getting from an airport to the airbnb vs. having a free airport-to-hotel shuttle, for example). The difference in price can often be deceiving once you factor in these other costs.