Blogs are a great way to increase your SEO and establish your "brand". They don't have to be content heavy, but some text and images that iterate key search terms will help bring traffic to your site. They provide another way to highlight specific qualities of your vacation rental and the surrounding area. It can also help the appeal of your rental by establishing a more personable and welcoming context to potential customers.
Blogs are highly variable and, while some of them can be content heavy, many successful blogs are relatively light on content.
Here are a some tutorials that should be helpful: