Yes. You have monthly repayments to meet. Even if they are paid in full by the tenants, you may well run into difficulties if you get bad tenants.
You should consider doing a Money Makeover.
It seems to me that you should sell your apartment and free yourself up to buy a house.
Alternatively, especially if you have a cheap tracker, keep the apartment and rent.
Buy buying a second house, you are exposing yourself to falls in property prices and rises in interest rates.
Who is the apartment loan with? If it's with Bank of Ireland or Ulster Bank, and you have a tracker, they might let you sell the apartment and move the tracker to the new house.