I think there are a number of ways to style your house in a cohesive way. One way is to use a mix of vintage and new in every room. This gives each space the same modern eclectic feel. Sophisticated but still with personality. Another fun way to create a cohesive palette is with color. Having a color story throughout the house gives consistency. You can vary how much of the color appears in each room and what object the color shows up on so that it doesn't appear "matchy" but still connects each room to the next. Just pursue one style throughout, don't explore traditional in your kitchen, contemporary in your dining room and bohemian in your living room!