The best place to stay during an Irish city break is the city centre so that the various tourist attractions and things you want to do are close to you. Most people visiting Ireland for a city break need accommodation with breakfast only because it is easier to eat in the various neighbourhoods you visit. That may be in a tourist attraction during the day and in a pub in the evening.
Holiday apartments in city centres are ideal for a stay of a minimum of three nights. They are usually self-catering but for most it is no trouble to rustle up a breakfast, especially if you tend to have cereal and toast. The advantage of renting a self-catering apartment is that you can stay out as late as you without bothering anyone on your return. Getting back at 3:00am is not going to inconvenience anyone. Because it is self-catering, you can make a cup of tea at that time and go to bed until whatever time you wake up ready for another night out in the city.
Dublin and Belfast are the most visited Irish cities and you may have your own favourites for that long weekend break. You could be visiting to take in a festival or theatre performance or to sightsee. We hope that you have a fantastic time during your city break in Ireland.