Are €26K and €18K gross or net income figures?
How long are you in business and how stable has your salary been over that period?
Obviously clearing the CU loan will help any application.
When you have set out your monthly budget (incomings and outgoings) what sort of repayments do you think that you can realistically afford? Allowing some room for rate/repayment increases?
For what it's worth €180K over 30 years at 5% is about €1K p.m. ignoring TRS and other mortgage related costs (e.g. life assurance, home insurance etc.)