The apartment was great. Lots of room, decent sized appliances, tonnes of closet space. Probably ideal for a long term stay or if you have a large family. The only knock on the space was that the bathroom could probably use an upgrade.
Communication with the hotel was poor however and the office is never open, even during listed hours. We attempted to contact them using email/contact us link numerous times but they did not respond. Just had to check the office multiple times every day to eventually get lucky. Really nice people but they need to be around a little more even in the off season. I suspect high season may have been better.
It is a great apartment though in a quiet little town just a short drive from lots of activities (geysir, Thingvellir, Selfoss, Lava tunnel, horseback riding, etc).