RED lights glowing in the windows of the Blythswood Hotel are an impish reminder of the days when the leafy square outside was a haunt of ladies of the night. The streetwalkers are gone, and the former headquarters of the Royal Scottish Automobile Club is now an elegant property with an awardwinning spa in the heart of the city. Originally a row of Georgian terrace houses, the B-listed building is a blend of classical features and bold contemporary design. A former ballroom has been turned into an airy restaurant serving fine cuisine; a cocktail lounge has views over the square. Thirty guestrooms in the main building are luxurious and spacious, with Spanish marble bathrooms; 70 classic rooms in a modern extension are slightly smaller. The star of the show is the thermal spa. More: townhousecompany.com/blythswoodsquare.