This seems like a perfect shelf and cabinet layout based on our spacing. Could work nicely if face of fireplace were raw or white brick. Crown molding look? (not sure what to call fireplace surround) may be too formal but generally like.
Bespoke fitted alcove unit, traditional dresser style, with book shelves and panelled door cupboards for a living room or dining room. MDF painted in light grey. Made by Oliver Hazael Bespoke Carpentry and Plastering in Bath, Somerset