How times have changed, the establishment was required to have a sign above the door showing that they were licensed to sell tobacco. Today they could not even consume tobacco in the premises.
With thanks to all the contributors below, it seems pretty certain that this is the Kane "Temperance Tea Rooms" (later "Kane's Royal Hotel"), at the Giant's Causeway in County Antrim. The date of the image is very likely c.1870 (+/- 6 or 7 years) and possibly c.1866. See the comments below for other images, adverts and items related to the hotel - which remained within the Kane family through at least the first half of the 20th century - but is now demolished.
Photographers: Frederick Holland Mares, James Simonton
Contributor: John Fortune Lawrence
Collection: The Stereo Pairs Photograph Collection
Date: ca. 1860-1883 (though likely 1863-1876)
NLI Ref: STP_2036
You can also view this image, and many thousands of others, on the NLI’s catalogue at catalogue.nli.ie
Owner: National Library of Ireland on The Commons
Source: Flickr Commons