I love this blue home. In fact I've had a thing for dark blue rooms for years. Once in my early design days I went ahead and painted our open plan living and dining room a dark and light blue combo. It was a disaster. Experience has not only honed my color choosing skills, but also taught me the importance of swatches and color testing.
This space, on the other hand, absolutely nails it! The grey tones in this blue are perfect, while the wood flooring and black and wood furniture are ideal compliments to the color, bringing in some even darker tones and a lightness without the need to use white.