Yes with no cash ever injected into a marketing budget, apart from some adwords use. For me this was a nice achievment. We did have 'news worthy news' , but this does not mean the biggest tech sites in the world will cover a small startup from Germany. It was timed, planned, and well executed with no budget (back to the OP)
You can also check our social media gains in the last 4 months (they arent massive but the % increase really relates). Social media is THE key influencer in promoting a blog/site with no budget. You have to work the whole package, not just content.