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!
I also agree that the interior should always be cozy and the main thing is the combination of colors. My new house was recently renovated, I also tried to read tips on the Internet, I needed to decorate the kitchen. I wanted to buy beautiful and stylish furniture. One day I stumbled upon this site astounding interiors with stylish furniture and decided to try ordering a sofa for my kitchen. Looks not really bad. I would even say this sofa fits perfectly into the overall atmosphere of the kitchen!