Merrion Square, deep in the heart of Georgian Dublin, has always been a highly sought-after location. Laid out in 1762 and built over 30 years for the estate of Viscount FitzWilliam, the square was a fashionable address for the aristocracy and, later, artists such as WB Yeats, George William Russell and Oscar Wilde all called the square home at one point. So when property becomes available, it doesn’t stay on the market for very long. This is certainly true of one of the stand-out properties on the north side of the famous square. The four-storey number 12, with its prominent…