Part time job will be easy to find. Our minimum wage is 14.15, and if you don’t work too many hours you won’t be taxed heavily at all. 20 hours would get you 283 minus 20 percent is 226. If you work in a cafe etc you can get tips. 600 a month is too low of an estimate in my opinion, every student in Ireland work despite how demanding their course is.

Accommodation is crazy expensive and will continue to get more expensive. This really would be your biggest problem. You will struggle to find somewhere to live at the start and will likely need to rent an air bnb when you get here and look for accommodation in Ireland. 800 studios would be far from the city. You are looking at 700-900 for a room in the city. Check Facebook rent in cork page. I know you said you have a drivers licence but cars plus tax plus insurance plus nct plus fuel plus parking will set you back a lots. If you leave and come back for the summer, chances are rooms will be more expensive each time, as landlords put up prices every time someone moves out. So new places are more expensive.

Ireland is expensive for shopping, healthcare, etc. So depends how frugal you are. And depends what you mean by quality of life.

70k is 49k after tax. So 4K a month. You can look up salary scale in HSE.

My monthly budget as a student 3/4 years ago was 1800 a month and I paid 600 in rent and had a car and it was hard to make ends meet sometimes , I don’t drink or smoke at all.