According to other expats, Bansko is the best place. If you ask me, and you’re working remotely, you’ll fit almost everywhere. The entire country has excellent internet connectivity, including in the mountains. You’ll get by with English almost everywhere, since most young people speak it. Older folks rarely do. You can buy almost anything online and get it delivered to your door or nearby office unless you’re in the deep province. So my advice is come, explore for a couple of months and then decide if and where do you want to settle.