The following paragraph appears in The Irish Tourist, by A. Atkinson, published in 1815.

A little below Powerscourt is the village of Enniskerry, which stands in a comparatively low position, and is composed of about twenty houses. Though unprovided with fair, market, or post-office, it has a pretty extensive inn, where gentlemen who come to visit the curiosities of the country, can be accommodated with neat articles. A house which stands at the bottom of the valley beneath this village, under the shelter of a planted hill, is a very pretty object in this scene, although the residence only of a humble publican.

The entire book is available to download from the Ask About Ireland website (170 MB). Although a brief description, it is an important one, as it probably just pre-dates the improvements to the village that would have began around 1818/1819.