We chose to spent 3 nights at Heart of Reykjavik due to its convenient location.
We loved the decoration, the customer service and help after our little issue with the heating (we would recommend the establishment to leave it ON before guest arrival, as it was cold when we arrived and we did not know how to turn it on).
Restroom is the part we enjoyed the less, as the amazing shower takes all the space and the sink ends up being useless due to its super small size. We ended up using the kitchen space sink to wash our face and hands instead.
The only thing we really missed was a little kitchenette where to cook basic meals. The studio is announced/provided with a toaster, microwave, etc. yet we did miss a little cooker where to boil pasta, for example.