Had a wonderful break with the missus and stayed in a couple of places with this being the best http://www.frostogfuni.is
Was a completely memorable trip where we saw some amazing things, and would love to go back.
Stayed in this place for a couple of nights: http://www.frostogfuni.is
Brilliant walk into the hills where you can bath in hot streams. Worth a look if you are planning a trip.