Now this is all personal deccission, but if you have the option for another morgage, I would go with real estate, becouse as I see it, it is basicly a long term short position on the curency, eur in your case, and those just keep going down ... after five years you will probably be in a range of 20% to 50% lower real debt since inflation is eating it away...
That's exactly what I think. I think I will be able to do both at the same time once I'm able to finish the current mortgage. Thanks for your feedback!