Stayed here during the Eclipse 2026 (aka, no corona but the eerie darkness with the wonderful community of Iceland, so still an otherworldly experience overall).
The location of this apartment is AMAZING. Steps away from lots of great tourist activities on the harbor, on the pedestrian walkway leading to Hallgrimskirkja, or most of the city. If you are able to do a lively walk or have family members old enough to bike around you can easily get down to Perlan or western side of Reykjavik too.
Apartment was clean, perfectly described, and check-in/out was very very easy and self-sufficient (we didn't arrive until nearly 1 am and there were zero issues, including getting easy street parking <2 blocks away).
If you are a non-Icelander, then you should know that 1) the hot water WILL have a relatively strong sulfur smell because it is literally coming straight from the fires of Mt Doom/the Earth's core. It does NOT make you smell after the fact but shower with the bathroom window open and bathroom door closed! and 2) each bed gets 2 personal sized thick duvet/comforter style blankets. These two things were both different than our typical USA hotel experience but it made the stay even more authentic. The place is truly amazing and was perfect for our family of four!