You dont say if your looking to make a profit or if instead this is a life style aquisition.

If its profit you want I would say you almost certainly wont make any time youve paid interest on loans (or lost ionterest on savings in the bank), Tax, fees, costs, ongoing management, flights and so on.

I've been at this a few years and find making money harder now a days.
I would'nt bother at all with Bulgaria as the rent season is very short.

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Been investing abroad a few years. Always amazed people invest in places that produce just a few months rent per year