Take the S9 or another train from the airport to Frankfurt Hauptbahnhof, then transfer to the S3 or S4 to Eschborn Süd. From there, it's a 10-15 minute walk to the hotel. It’s also worth checking Uber or Bolt prices if you have a lot of luggage. Momo Roll is an okay Korean fast-casual place. There are also other Korean restaurants in Eschborn, as many Korean companies have large offices there.
S3
S4