The price is right. The view is stunning. And these two sparkling new apartments in the heart of the Fenway come with a perk sure to appeal to most culture vultures: After-hours access to one of the world’s most prized museums. There is a catch. Not just anybody can stay at the Gardner Museum. To score one of these spaces, you have to be an artist-in-residence. And an entire wall of the living space is glass, so the artists will themselves will be on display.