Secondly, an interior designer who blogs is most likely reading blogs and educating themselves. You can rest assured that if your designer is blogging, they are current with trends and new products. Sometimes designers will get used to a design style that works for them and just reuse and repeat. This is probably not something that you want unless you love what the designer has already done and literally want a duplicate. It’s important for them to be innovative, and involved in the industry in my opinion.
Finally, blogs gives you a glimpse of the designers personality. Working together is a very personal experience. It happens that I get clients that I just don’t click with. I’m not saying it doesn’t work out in the end but it does take longer to understand each other, feel comfortable sharing opinions with each other and overall making it a fun experience. It does eventually get there as you get to know each other, but it definitely helps when there is an instant connection. Their blogs can give you an idea about what’s important to them and help you determine if they are the right designer for you.