I have seen this apartment a few times now, a couple of years ago in a Finnish design magazine (had no idea whose it was, or what the text said but I could love the pictures), more recently in Elle Decoration and now on the ever inspiring DesignSponge.
It belongs to a Finnish interior designer and is composed of classic monochrome with flashes of colour and of humour. It also has a lot of DIY and imaginative pieces used throughout. I love the fir tree wallpaper below and the recurring geometric print.
Images from DesignSponge