We stayed in Butterfly Guesthouse in August. The room is nice, cosy and clean with a small but complete bathroom and a big shower. The place is very clean and all the facilities for breakfast are available. We rented also the camper for a 2 weeks tour around Iceland and it was even better. The camper was almost new and very well kept and equipped with anything you may need like linen, towels, kitchen equipment, cleaning items, detergents etc.
Jon and Olafia are really great, they stayed in touch with us while we were around Iceland sending us mails with suggestions on what to visit, weather forecasts etc.
Next time in Reykjavik we'll undoubtedly go again to Butterfly.