I stayed at the Dalmahoy for a week in December a couple of years ago. It does have the feel of an old country estate - an older property, but well maintained. The staff was great, food was quite good - a couple of choices on the property.
It's a little out of the way, but there is a bus into town that stops about 5 minutes away, or of course you can drive.
All in all my stay was quite enjoyable and I'd recomend this location.
Bruce