Interior designer Frank de Biasi and his partner, fashion designer Gene Meyer, let the lease run on their Park Avenue apartment after seeing how their second home in the Moroccan port city of Tangier turned out after four years of renovations. Bright and whimsical and with a beautiful rooftop terrace, it’s not difficult to see why. 1940s chintz intermingles with colonial Portuguese rosewood, treillage and wicker in a medley of old and new, print and pattern, and all drenched in shades of tea and teal and tangerine, saffron and ochre and dusty pink…