Extremely low, sloping ceilings in our room cause us to accidentally bump our heads, hard, in my wife's case many, many times, as she was the one on that side of the bed and is, unfortunately, accident prone. We made our reservation well in advance and I was disappointed to be booked in what felt like a "last available" room with a lot of compromise.
The person at the front desk was also very strange, rapidly switching between very rude and very sweet, and hard of hearing -- after several extremely inconvenient mistakes, she took our her ear piece to prove it. I first chalked this up to some kind of cultural difference, but I think she was just an extremely weird person. During these inconveniences, she retreated to the back office, and the front desk was unattended with no bell. You had to shout for someone who, I'll again mention, was literally hard of hearing.
Other than that, lovely place. Great design choices, fine and useful breakfast, and unbeatable location for the start of your Icelandic journey.