This was a nice little cottage on a beautiful plot of land. The house is small, but is pretty well outfitted.
The biggest problem for us was the tiny water heater. There was not enough hot water for one person to take a shower, much less the four people we had! It's not a deal-killer, but something to be aware of. Also, while the property required the dishes to be cleaned and put away, apparently dish soap is not included, go figure. We asked for some, but ended up having to go into town to grab some just for the two nights we stayed at the cottage. Not a huge deal, but a little discouraging.
Apart from that, we loved wandering the land, and did so for a few hours. The cottage is only about a 20 minute drive to Husavik, and 30-45 mins to lake Myvatn, so there is plenty to do and see during your visit to Hagi Cottage.
We recommend a visit, just be aware of the couple of inconveniences and you'll be fine!