For the past month, Loop diners have been packing into Mariela, the bright, beachy seafood spot in the StayPineapple hotel (1 W. Washington St.). The Mariela team is hardly new to Chicago dining — Zubair Mohajir, David Mor, and Rishi Kumar are running the show, and between them, they’ve got their fingers in places like Lilac Tiger, Coach House, Mirra, and other buzzy spots. The space has been totally transformed from the eclectic and hard-to-navigate Atwood Café to a much more luxe, relaxed vibe.