You asked what I would do...
You can take €50k out of one property and €140k out of the other.
You'd save €6,365 a year by having a mortgage that's €190k smaller (based on your suggested rate of 3.35%).
Alternatively, you can generate €37,200 of rental income a year.
You're paying a tiny anount of interest per annum, €1,950 or thereabouts. You'll obviously have tax and other costs to come off your rental income and you have to fund the capital repayment element of the mortgage payment.
And you are very concentrated in terms of asset class and geography.
That said, I'd keep them both; it's a once in a generation opportunity to fund an investment at almost zero borrowing cost. An investment into an asset where demand massively exceeds supply.
Some may disagree, but I'd keep them, but I'd be looking at my pension provision and looking to boost that.
I'd also continue to assess the position. You're not wedded to the properties forever.