We stayed in apartment 90. It was great. Very clean (cleaned daily) and in a perfect location. It was quiet at night and a short walk to the shopping streets and the harbour. It was easy to check in, pressed the buzzer to get in and our keys were waiting in an envelope. They then rang us to check everything was ok. We could call anytime with questions which wasn't necessary as there was lots of useful info in the apartment. You could use the phone to call Icelandic numbers for free.
I'd definitely stay here again.