Tucked off the beaten track, you might mistake Hotel Mercer for another of Barcelona’s ancient historical buildings – and you’d be right. Seamlessly combining original Roman walls and a tower with local sandstone to create an authentic yet highly polished design, Mercer is an undiscovered treasure. Relax on the terrace overlooking the Gothic quarter, curl up on the delightfully comfy beds or take a steaming rain shower, the hotel has really tuned in to what any traveller desires most. Tasteful décor is paralleled by tasteful dishes in the hotel’s Mercerino restaurant, where impeccable and thoughtful service meets a flair for design, both on and off the plate. A unique hotel from top to bottom, Mercer fully deserves its place amongst the best of the Boutique.