2,85 € is the correct price for oneway from airport to Hbf.
Think about buying a tagesticket or tagesticket 9am if you plan to take more rides during the day.

Butchers or Meatery are great steakhouses. Buchters is some kind of a small and private Morton's, Meatery pretty stylish wiht mostly dry aged meats.
If you are looking for something simple and inexpensive, turn to your right or left towards the next Blockhouse. It's simple but quite good and much better than our other german steakhouse chain.