I would find the best fixed rate and go with that.
The ECB will not lower rates any further in order to curtail inflation in France and Germany.
In my opinion if anything they will start to increase rates.
If you are staying put in your home I would recommend fixed rate of 3 - 5 years.
If you think your going to move home in the near future I would recommend a short fixed term.
In addition, if during your fixed term you release that you can afford to pay extra and want to put it against the principal then you can. You can pay in extra in the mortgage but the extra repayment will come off the prinicpal amount when the fixed term is up. (PTSB: this is what they explained to me, I hope thats correct).