Helena and Mattias' transformed their two room house in Gothenburg, into a five room house (The Swedish do not include the kitchen and bathrooms when they count rooms). By utilizing the attic space and redesigning the layout they have opened up so many possibilities. Space and lots of white give their house such an airy feel.
They designed the windows to allow breezes to flow though the entire house. The article goes no to mention that their cats are doing great on their open stairways but there are railings on order for the humans.