If there is an original Icelandic Country Tavern, it is Gamlibær (The Old Farm) at Reykjahlíð.
From early morning to late afternoon it is dominated by the atmosphere of a friendly Café

 Opening hours:
Gamlibær is open all day, every day and offers low priced meals, coffee and cakes, candy and sodas as well as beer and other alcaholic beverages.