We honeymooned there for three weeks.
We had a great time, and no safety issues, but we were pretty vigilant at all times. We rented a car and drove widely, though we did avoid driving long distances after dark, and in some places that we stayed we were advised to drive instead of walk for local journeys such as to restaurants etc.
To be honest I feel a lot safer in general in Ireland then I did there, even though nothing happened. This wouldn't stop me from going back but I was conscience of the need to be alert.
We all hear about the safety issues in the country, and South Africans talk about crime the way the Irish talk about property so you'll not meet too many people down there who don't have a story to tell. The main thing is to be alert, don't be flashing your expensive goods around, and don't leave anything whatsoever on display in your car....and have a great time.
The only personal experience I had was being followed by two lads as I went to dump some leftover burgers and chips into a rubbish bin. I was aware that they were coming after me and was very freaked out, but it turned out they only wanted to eat my unfinished food from the bin...so for me it was a humbling illustration of the paranoia and deep poverty that can exist in the country.