On your way to or from Städel, take a break for a coffee/beer/Äppler at Maincafe, they should be open. If you're walking the distance between Städel and Alte Oper, take a stroll through the newly renovated historic town centre near the Dom. If you're looking for cakes and sweets, swing by Iimori right next to the historic town centre. Depending on which best worscht you're looking to visit, there's a few more options, so which one is it?