Personally I think Old Town is going down the pan. Like many people we tend to look in on virtually every visit but on the last two we have seen a difference. The last time was a midweek evening and there were people who were drunk and a few who looked to be under the influence of other things and they were being a nuisance. There was no security anywhere in sight.
You should also be aware of a scam that has been happening. When you go to leave you are followed and asked for money for a 'donation' before you get in your car. Happened to a friend of mine and I recently heard of it happening to someone else.
Best time to visit I would suspect is on the nights of the car parades but at other times make sure you are alert.
Terry