Tax deduction for renovations is $5k per year ($7.5k next year). Or well, less now that 1 USD is 11 SEK instead of 10.

You make it sound like you can just start a company and hire yourself, and the biggest drawback would be more complicated taxes... No, the biggest drawback is that you're starting a business and taking a (much) larger risk than being employed. Hiring an accountant to help with the bookkeeping is a minor thing in comparison.