Photo by Jakob Montrasio Few colonial mansions in Shanghai epitomize the romance of the roaring 20s the way the almost century-old three-floor French style villa that today houses Sasha’s does, so if you still haven’t found a place to take your special someone to this Chinese Valentine’s, you might want to consider this one. Feast under the roof of what used to to be the Shanghai home of the Soong Family located in the…