As another reviewer pointed out, locals don't eat here. I ate here on my very first night in Reykjavik and as I wasn't yet accustomed to Icelandic prices, got quite the shock. However the food was decent, I had a nice chicken club sandwich. The waitress was very friendly and welcoming, something you will find in nearly all Icelandic establishments.
Right next door, is the far superior Tapas Barinn, probably my favourite spot to eat in Reykjavik.