Pros (+) The rooms are simple but very nice. Everything is new and it was perfectly clean. There is a kitchenette in the room. The owner was very kind. She offered us toys and extra pillow for our son. If it's raining or if your flight is early ( it's pretty close to Keflavik by car) If you are going to Blue lagoon or if you're not afraid to drive a bit to go to Reykjavik, it's a good place for you.
Cons (-) The Guesthouse is a old warehouse nearby the port so it smells fish and the outside isn't cute at all.