I was there for a few days last summer. Beautiful place. It's a bit spendy, so having a place to stay would be a fantastic windfall. Iceland Air is really reasonable, and I noticed last time I was through SeaTac that they fly out of there. My only advice would be (a) bring a sleeping mask, and (b) bring some serious insect gear if you're planning on hiking. Both of those bits of advice would have made my stay marginally more enjoyable. Definitely recommend though.