Assuming:
- no changes in salary
- an effective tax rate of 35%
- mortgage of 320k over 30 years at 5.5%
- personal loan of 10k over 5 years at 10%
Your mortgage repayments will be 1817 euro/mth
Your personal loan repayments will be 212 euro/mth
With the personal loan, that's 37% of your Net Take Home going on debt every month.
Without, it's 35%.
So not a huge difference, unless the banks you're applying to have a threshold of 35% net take home pay.
The bank will obviously have to consider how much of a deposit you have, what kind of house you need etc in terms of whether to approve your mortgage.
One other thing- start filing your bank statements, P60's, savings records etc. so that you have all your documentation ready when you go to apply in 2-3 years time. Requesting duplicate documentation from banks for mortgage applications takes time, and is expensive.
Best of luck