Could be costly - if you didn't pay stamp duty on the purchase you are not living there long enough to qualify for the waiver so basically you would have to pay the stamp duty that would have been due if you had bought the apartment as anything other than your PPR (primary private residence).
Renting as an overseas landlord means your tenant would be legally bound to withhold 20% of the rent to forward to revenue for your tax liabilities, so you're down another €80 a month. Can you afford to pay €130 a month for an apartment you don't live in?
Then add in PRTB registration, the chances that you won't have tenants for all the time you're away (breaks between tenants etc), repair/replacement costs, upkeep, management fees.....
Starting to look like an expensive move?