Hey, we are actually renting out our countryside house for 6 months to an year. It{s in tha balknas mountain nad near the town of Tryavna. Literllay last house in the forest. You can see it on our workaway profile where yo ucan see we're no scammers - after having many volunteers here. Maybe that would a good start for you to find a house in Bulgaria. The last couple we had did exactly that and now have a beautiful house near gabrovo, in the mountains.
https://www.workaway.info/en/host/432238953496